Malicious PDF — malware analysis report

Static analysis result for SHA-256 36435a1a6a4beced…

MALICIOUS

PDF

28.4 KB Created: 2021-07-19 12:01:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 123e1013724e66ba95afab3b04c2b69b SHA-1: c6a907b602ff84d0ace9d463aee2648f9f2946bd SHA-256: 36435a1a6a4beced4242d51c5fd14aefd0a73b899eaa8a46bde5a5d0b587c9fa
92 Risk Score

Malware Insights

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

The PDF file contains a link to a website promising a "free Robux generator" and displays a fake CAPTCHA to trick users into clicking the link. This is a common social engineering tactic to lead users to potentially malicious sites. The document body explicitly mentions "CLICK HERE TO ACCESS ROBUX GENERATOR", reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0329

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/431946152/rblx-city-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
font_00_sfnt_off00001d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4E 21164 bytes
SHA-256: 0d60bf798de8a33fc2770b51800e5ddcabb60cc5213cb53a19b5ebac11e9458c
font_01_sfnt_off00004bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BED 18680 bytes
SHA-256: ce3d52f7a93c593ce2eefb8e45dcd2efc7f486213a1d54846bed04cc16d50f6a

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