Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f4a246967bfbe6…

MALICIOUS

PDF

36.7 KB Created: 2021-05-12 21:32:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 68712a4aca53a80a651bfab400e416cd SHA-1: 47fb35786cff8c33c79aed9fff44534e86dc8d76 SHA-256: b1f4a246967bfbe6f07cf02649e420f279ea6c170155a37573ad03b6a76b246a
92 Risk Score

Malware Insights

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

The PDF contains a high-confidence heuristic indicating a lure for a 'free generator / game hack' by impersonating Microsoft. The embedded URL, https://netcdn.xyz/app/431946152/free-robux-hack-no-human-verification-game-hack, is presented as a call-to-action, suggesting it leads to credential phishing or a malware download. No scripts were extracted, but the PDF structure and heuristics strongly suggest a malicious intent to trick the user.

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/free-robux-hack-no-human-verification-game-hack.
  • 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-hack-no-human-verification-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_off00003473.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3473 24264 bytes
SHA-256: 413df9f83ab508f8d7bcaeb0b3ca1c7ff64754503239b19af8b8b4a68959a0e8
font_01_sfnt_off00006bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFB 19028 bytes
SHA-256: 768a4e91d7c3975acc2b79a699acb909e0f8bbf2befa87684aa1b4f9aecc197e

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