Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a117d2cdf16c9b5…

MALICIOUS

PDF

31.1 KB Created: 2021-05-12 21:47:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 20bad195384cc238392fc2a2a12e360f SHA-1: 71bda7e8a19bf4e7ccf5d6f21fb7d15d34bb700f SHA-256: 6a117d2cdf16c9b5315df9e7651722dc596d5e6ccec9624943532fc936a4310d
170 Risk Score

Malware Insights

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

The PDF document contains a lure for a "Robux Win" generator, impersonating Microsoft to trick users into clicking a malicious link. The embedded link, https://netcdn.xyz/app/431946152/robux-win-game-hack, is identified as a malicious redirector and a credential phishing attempt. The document's structure and content suggest it's designed to exploit user interest in game-related generators to facilitate phishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.0564

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/robux-win-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
  • 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/robux-win-game-hack In PDF document text
    • 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_off000024fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24FA 23884 bytes
SHA-256: 00def6756d253a858605e8f2510c8761c682e6c96e60cc7c7731b2ba1ebb0c79
font_01_sfnt_off00005b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B24 17280 bytes
SHA-256: a792481f9b456e9fecb3b416ca257d785c517fb0bb0457419561a1d875743b73

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