Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e9f3723ab63c98…

MALICIOUS

PDF

36.1 KB Created: 2021-05-16 02:30:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4bdb1debe8819958880fb01a258b4e37 SHA-1: 12cb0aed5b1360eba0bb7834f5ed8090a4c0cac8 SHA-256: 55e9f3723ab63c98f980e5587d214b45dcee4ca67a2cbade4361f1c9ab3b3422
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 Robux generator" which is a common lure for malicious content. The document also displays a fake CAPTCHA or human verification prompt, designed to trick users into interacting with the malicious link. The primary URL associated with this lure is https://netcdn.xyz/app/431946152/free-robux-2021-game-hack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0302

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-robux-2021-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_off000032ea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32EA 24488 bytes
SHA-256: afc590506e174cd5ba0f6164f2a66370136c2a23d108aa49a01f80bbfeff059a
font_01_sfnt_off00006b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B28 18416 bytes
SHA-256: a2c808792aaeb1607b9c3a91ae122c662faffffe8d42f3cf4118be6ccc5b3e7b

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