Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c198b7c2f61272a…

MALICIOUS

PDF

29.9 KB Created: 2021-07-19 00:33:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 151aa57a909c712c40be078233a68d25 SHA-1: ca2e401eda02e0bd5983fd071f62fdc74e701f5e SHA-256: 2c198b7c2f61272aba70332378bbdaa0aa405d16db8d94b5236f2b00bbc84328
92 Risk Score

Malware Insights

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

The PDF file contains a link to a 'free generator / game hack' which is a common lure for malicious content. The document also displays a fake CAPTCHA or human verification prompt, designed to trick users into performing actions that could lead to further compromise. The primary IOC is the URL leading to this lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0556

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 http://netcdn.tw/app/479516143/minecraft-free-ios-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
font_00_sfnt_off000022b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22B4 22764 bytes
SHA-256: 62c7cdfb0efb1b29937572a42da84beb9aa6df0e9df4a7e5a4372e2a7e2ca2a1
font_01_sfnt_off0000553e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x553E 17712 bytes
SHA-256: 54d91aee1a0896e30cfb652b9b9fc91e7951cfaa65da7a48657c461bc2dd637d

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