Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bfe2cce630ea0c…

MALICIOUS

PDF

36.7 KB Created: 2021-05-11 06:33:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 607bfe70202d559a32b40ac6d6a2e90b SHA-1: 1947957005b4b55140550f02b2912b1a42c4d116 SHA-256: 81bfe2cce630ea0c037c1777d77dff2f48ca5c5dcc0b1ebfc47119c2152c187d
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a lure for a "free Robux generator" and displays a fake CAPTCHA, aiming to deceive the user into clicking the embedded link. This link, https://netcdn.xyz/app/431946152/free-robux-only-username-game-hack, redirects to a malicious site. The document's structure and content strongly suggest it's designed as a phishing or scam document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

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-only-username-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_off000032fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32FA 24896 bytes
SHA-256: a1518182a31e5b1aed869996da917d501e6866c6cc8d25eb690a21b8017ea997
font_01_sfnt_off00006c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C13 18944 bytes
SHA-256: 70265b1ab56d97b784f4fe2fa404654962f548e46b6ffa550f521079ee450d9c

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