Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a79cbff3f018ecb…

MALICIOUS

PDF

37.6 KB Created: 2021-05-15 11:00:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fb0fd8796402348dfbef473762e329cb SHA-1: 5b4e6555e005d58d8fde3e933f88daf238f64a4e SHA-256: 7a79cbff3f018ecb0d63fc173e30010bc120749a64eda61e6356600b89f5827f
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high-severity heuristic indicating it links to a 'free generator / game hack' redirector, and also flags a fake CAPTCHA lure. The document body and embedded artifacts are heavily obfuscated, but the primary URL points to a known malicious domain associated with scams. The presence of a fake CAPTCHA suggests an attempt to trick the user into performing an action, likely leading to a malicious download or further compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://netcdn.xyz/app/431946152/how-to-get-free-robux-on-android-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000032f1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32F1 27288 bytes
SHA-256: fe4be8eaf2d1169f6ccc5cc6ce09ae9d4256c1b0e5a17822e1c411f74f41cd94
font_01_sfnt_off00007091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7091 18576 bytes
SHA-256: be12fe34256d848f1a7db569f7882c3333b0548de7731ecd127307da0fa566a6

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