Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b529244230fcb7…

MALICIOUS

PDF

40.2 KB Created: 2021-04-22 14:56:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0aebcd635c17fe1879b339070508cc4d SHA-1: bd194774fd5aa2287099424e0dcca118a7cb8ff4 SHA-256: 73b529244230fcb7355817c758b41d90b5bad802d9a01fa36bb7d956221e8fa5
72 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it is a lure for a "free generator / game hack" by linking to a suspicious URL. The document body also contains the same URL and a call to action. No scripts were extracted, but the presence of embedded URLs and the lure suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0228

Heuristics 4

  • 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.
  • 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 https://netsecure.pro/app/431946152/free-roblox-full-lua-game-hack PDF link annotation
    • http://yucaboats.com/images/duck-roblox-free.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003764.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3764 24580 bytes
SHA-256: 23dc500472bfa1108ea4ff316f8461165465ac1e0ace7ae3b592754bd0308f6f
font_01_sfnt_off0000700e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x700E 3312 bytes
SHA-256: 40bd8eebcb3a0d68a8646f1930e84f30a44bfa48525263c6c528f0bc1e9c1677
font_02_sfnt_off00007b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5E 18316 bytes
SHA-256: f9420c1f6e49db5a51c3f73f300c441a0a61393cbece4593cdaa8b0ecba8205d

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