Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a626be079f28d0…

MALICIOUS

PDF

37.9 KB Created: 2021-05-11 02:13:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5dd3c110be332c3d32d21d6f8e07b954 SHA-1: 2649d6b75189d2fe5dba943d5f0a4cb299ef8121 SHA-256: f2a626be079f28d0e3a88d100b42abfc463e90d1c44a142b2ac3a0f8dd943adf
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 0.0334

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/free-promo-codes-for-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_off0000361b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x361B 24572 bytes
SHA-256: 9a3ca45f4cf2888c6fca0df7ff864876d9234580bb652f1e312e3aa029e746c8
font_01_sfnt_off00006d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1B 20208 bytes
SHA-256: d985e2885483beb935afe947564ff0483fa6741d88f630bff40d66c03a1cd7a8

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