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Merged
markmsublime merged 2 commits into from
Sep 9, 2026
+23 −0
Merged

Create attachment_pdf_link_dubsh.yml #5289

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35e80f7
Create attachment_pdf_link_dubsh.yml
zoomequipd Sep 8, 2026
48a4aaf
Auto-format MQL and add rule IDs
Sep 8, 2026
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23 changes: 23 additions & 0 deletions detection-rules/attachment_pdf_link_dubsh.yml
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name: "Attachment: PDF with dub.sh shortened link"
description: "Catches messages carrying PDF attachments that embed links shortened through the dub.sh service. The lures vary widely, from fake 'password protected document' or e-signature notifications to business submission and proposal requests, but each relies on a PDF containing a shortened link to obscure the true destination and evade URL-based filtering."
type: "rule"
severity: "medium"
source: |
type.inbound
and any(attachments,
.file_type == "pdf"
and any(file.explode(.),
any(.scan.url.urls, .domain.root_domain == "dub.sh")
)
)
attack_types:
- "Credential Phishing"
- "BEC/Fraud"
tactics_and_techniques:
- "PDF"
- "Social engineering"
- "Evasion"
detection_methods:
- "File analysis"
- "URL analysis"
id: "36c01114-5437-5417-83ca-e8bdcd0c4488"