Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91cf3f3dc6dcdfc…

MALICIOUS

PDF

1.1 KB Created: 2021-07-05 07:03:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 97598ffa8ce10ae2a430a651891560e7 SHA-1: 054d864851e1f39d512a178cd5079eb2dccd47d1 SHA-256: a91cf3f3dc6dcdfc0e2f65d58aa8129139dd0444dbe8ea76afe8d1d660252778
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded URLs that direct users to download an application presented as a game hack. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The document body and heuristics confirm the presence of external URIs pointing to a download, suggesting a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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/406889139/mcpe-master-hack-coin-apk-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-spins-cheat-codes_GM406889139.pdfIn PDF document text

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