Malicious PDF — malware analysis report

Static analysis result for SHA-256 af126de7245a231c…

MALICIOUS

PDF

41.1 KB Created: 2021-05-17 19:33:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 41e3341793eef7464ba5a2e8d3dcd1d5 SHA-1: 2d4c778f4fc90f433b8acbe43f18b2aa9ee9e9c5 SHA-256: af126de7245a231c4eae4731677566baffb3eede150d8c1cf3aec8ad54262a45
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a high-severity heuristic indicating it links to a 'free generator / game hack' redirector, and also displays a fake CAPTCHA to trick users. The embedded URL leads to a domain known for hosting such lures. While no scripts were extracted, the overall pattern suggests a phishing attempt to direct users to a malicious website, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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-earn-robux-fast-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003086.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3086 29192 bytes
SHA-256: d9dd755e968aa4450ab726233d0b961977094910b94f24cfaba0ef004e741303
font_01_sfnt_off00007375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7375 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off0000801d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x801D 17968 bytes
SHA-256: 8f95186729095092911540f125087dfd51f74f8c9c527ce28ebecbad12925494

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