Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df3ab199a186a59…

MALICIOUS

PDF

26.1 KB Created: 2021-05-12 09:35:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3ed50e5556cbb02bc3e25845a3d36d21 SHA-1: 92f3afd7d961d571005dbb7407b3347bd56feb1d SHA-256: 4df3ab199a186a598ab8818dc9eee4ea54c3098cb871b8708bd1de9a218b6abf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a malicious URL, disguised as a game hack generator. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the presence of malicious redirector links indicates an attempt to lure users to a potentially harmful site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7812

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 https://netcdn.xyz/app/406889139/daily-free-spins-for-coin-master-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000034ae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34AE 24464 bytes
SHA-256: 2ceeefba61744e32e40deb6a9f6336f3022f9ea0c388a0830aad7896efb8f83b

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