Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90741ade2de6671…

MALICIOUS

PDF

35.8 KB Created: 2021-05-10 09:50:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f43ecd9d77b963dfe58ca2c4d700365f SHA-1: 4670e5a28c09f1778030d04616ea5bc3a13dbf7a SHA-256: c90741ade2de6671a770397eb6ada64769223c43c57eb36c77d10cbec2d146a1
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/431946152/robux-hack-free-robux-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_off00002f20.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F20 25928 bytes
SHA-256: 17c0aa74b156ce16f5edf3a107a6a97ff8c340fed30e4430606058971a35516a
font_01_sfnt_off00006a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4C 18412 bytes
SHA-256: e7ad190f023b5a59f82d5d2304e728b1fb84096fbbeb22520bbc212286f43b51

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