sublimelowRule

Attachment: PDF file with link to fake Bitcoin exchange

Fraudulent message containing a PDF notification of unclaimed Bitcoin assets. The PDF file contains a link to a fake Cryptocurrency portal. Attempting to withdraw funds prompts the user to enter payment information.

MITRE ATT&CK

T1566.002 T1534 T1656 T1598.003 T1566 T1598

initial-access

Detection Query

type.inbound
and sender.email.domain.root_domain in $free_email_providers
and length(attachments) == 1
and all(attachments,
        .file_extension == "pdf"
        and regex.icontains(.file_name, '(\d\.\d{3,4}.{0,12}BTC|bitcoin)')
        and any(file.explode(.),
                .scan.exiftool.page_count >= 5
                and .depth == 0
                and length(filter(.scan.strings.strings,
                                  regex.match(., '^\/URI \(http.*')
                           )
                ) == 1
        )
)

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

References

https://app.any.run/tasks/93d72f24-c021-48ad-a8eb-9b30c8660938

Tags

Cryptocurrency

Raw Content

name: "Attachment: PDF file with link to fake Bitcoin exchange"
description: |
  Fraudulent message containing a PDF notification of unclaimed Bitcoin assets. 
  The PDF file contains a link to a fake Cryptocurrency portal. Attempting to withdraw
  funds prompts the user to enter payment information.
references:
  - "https://app.any.run/tasks/93d72f24-c021-48ad-a8eb-9b30c8660938"
type: "rule"
severity: "low"
source: |
  type.inbound
  and sender.email.domain.root_domain in $free_email_providers
  and length(attachments) == 1
  and all(attachments,
          .file_extension == "pdf"
          and regex.icontains(.file_name, '(\d\.\d{3,4}.{0,12}BTC|bitcoin)')
          and any(file.explode(.),
                  .scan.exiftool.page_count >= 5
                  and .depth == 0
                  and length(filter(.scan.strings.strings,
                                    regex.match(., '^\/URI \(http.*')
                             )
                  ) == 1
          )
  )
tags:
  - "Cryptocurrency"
attack_types:
  - "BEC/Fraud"
tactics_and_techniques:
  - "Free email provider"
  - "Impersonation: Brand"
  - "PDF"
  - "Social engineering"
detection_methods:
  - "Exif analysis"
  - "File analysis"
  - "Sender analysis"
  - "URL analysis"
id: "47601cb7-5278-58b1-b503-0456c235a18d"