Attachment: GCPay blurred check PDF

calendar Oct 20, 2026  ยท
Share on: linkedin copy

Detects inbound messages with PDF attachments that match a YARA signature for blurred check images observed in a GCPay related phishing document

Sublime rule (View on GitHub)

 1name: "Attachment: GCPay blurred check PDF"
 2description: "Detects inbound messages with PDF attachments that match a YARA signature for blurred check images observed in a GCPay related phishing document"
 3type: "rule"
 4severity: "medium"
 5source: |
 6  type.inbound
 7  and any(filter(attachments, .file_type == "pdf"),
 8          any(file.explode(.),
 9              any(.scan.yara.matches, .name == "pdf_gcpay_blurred_check")
10          )
11  )  
12attack_types:
13  - "BEC/Fraud"
14tactics_and_techniques:
15  - "PDF"
16  - "Social engineering"
17  - "Image as content"
18detection_methods:
19  - "File analysis"
20  - "YARA"
21id: "d3ceaac4-a49a-515a-ad76-0fcc13800542"
to-top