Malicious PDF — malware analysis report

Static analysis result for SHA-256 990973bb9dab9bdc…

MALICIOUS

PDF

1.1 KB Created: 2021-07-05 17:01:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0d38c5b1c4a341b347a96d0f76c4ec1d SHA-1: cde42319053c9c39e56c28cff7603fe8b38f0e20 SHA-256: 990973bb9dab9bdc3cd88f7b3fb91d493f57f04b4fd04efc8074ef0ce6de28c8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded links that redirect to known malicious infrastructure, specifically promoting a 'free generator / game hack'. The document body and heuristics indicate a lure designed to entice users to click these links. While no scripts were explicitly extracted, the nature of PDF redirects often involves JavaScript execution to facilitate the redirection, hence T1059.007 is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 3

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/431946152/free-robux-gift-card-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text

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