Malicious PDF — malware analysis report

Static analysis result for SHA-256 aadf4fc01c726db5…

MALICIOUS

PDF

36.6 KB Created: 2021-05-10 12:00:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f9505a3417ced86411cd95401780db36 SHA-1: 117c3111c94d2ebfabdb5187663d7382146d7ff2 SHA-256: aadf4fc01c726db55884f08993f583fbfba957a132df4f1f3720462d4c525e13
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 0.0292

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-how-to-get-japan-sushi-card-free-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_off00003328.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3328 26060 bytes
SHA-256: 9e6202dad8db9148e25a1f250f9db16858de4aac5c3c1dc5f14ae3051ae2291a
font_01_sfnt_off00006c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C99 18696 bytes
SHA-256: b658d8f1c141fc8c479f08926c8ce77f4430151ae81ac58e32bab20f08e84866

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