Malicious PDF — malware analysis report

Static analysis result for SHA-256 b541c2de590d4084…

MALICIOUS

PDF

35.6 KB Created: 2021-05-12 05:52:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c9a3d9c65bac1dad8b28792de6818037 SHA-1: 84d6f632cfbc268f654dd4ebeb2bc8b0ada5acc1 SHA-256: b541c2de590d4084d7b2a18553efdef3ea3614ee3df4f1569a9a7367c0f43e26
92 Risk Score

Malware Insights

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

This PDF document was flagged as malicious. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier clean score 0.0265

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/406889139/coin-master-bonus-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_off000033a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33A5 24220 bytes
SHA-256: 56386fc8758ad84eab29f4c0f267f0b9798d07ff3235f1704fcccefa86ef0be7
font_01_sfnt_off00006ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE7 17900 bytes
SHA-256: d4cb4f8b582e53d36decfc4acea5f7bd3ab490a7e6a584b333508c86d745803e

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