Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f4fa01b6756ea5…

MALICIOUS

PDF

32.5 KB Created: 2021-07-19 15:36:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 93bfcb98a0548a8481d7cacefd0e5e79 SHA-1: 5a3d4c1333889cc876937c5656ec4a4841962203 SHA-256: 54f4fa01b6756ea53cd84c85f537fce968036d13f5f4ef3ac3aadbe5800cdc57
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a "free generator / game hack" which redirects to a malicious URL. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a potentially harmful site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-spins-coin-master-app-game-hack PDF link annotation
    • http://hocquaux.fr/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://hocquaux.fr/images/how-to-get-free-tiktok-fans-without-human-verification_GM835599320.pdfIn PDF document text
    • http://hocquaux.fr/images/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://hocquaux.fr/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://hocquaux.fr/images/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://hocquaux.fr/images/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • http://hocquaux.fr/images/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://hocquaux.fr/images/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://hocquaux.fr/images/free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • http://hocquaux.fr/images/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002a63.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2A63 23068 bytes
SHA-256: e38923a13c254f69e69c574f0378b0388fe25d9e7d1ef333ea268b7479a68bb9
font_01_sfnt_off00005e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E16 17884 bytes
SHA-256: ed1ea3c4e7635b9f65a5e0b6798c92341d7c1feababf17669f4466b6be8364ea

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