Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d45af8a1ac3f44…

MALICIOUS

PDF

38.0 KB Created: 2021-05-10 12:07:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 324c235ca97cacb30d6c145861322693 SHA-1: 85cdaf527595f9151503688089067bafe862d02d SHA-256: 42d45af8a1ac3f44fb1f57cf5ee0f705a886f0557cccfc932e6086ddfaebc6f1
92 Risk Score

Malware Insights

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

The PDF contains a high-severity heuristic indicating it links to a 'free generator / game hack' redirector, and another heuristic suggests it's an MFA/one-time-code harvesting lure. The document body explicitly mentions 'How To Get Free Robux Instantly' and includes a call to action to 'CLICK HERE TO ACCESS ROBLOX GENERATOR', directly supporting a phishing or credential harvesting attack pattern. The embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/how-to-get-free-robux-instantly-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_off000036ba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36BA 25484 bytes
SHA-256: 29436ae8a4f602364a824f97fdedfe80c3ef853af15316e5e269c12df5025a50
font_01_sfnt_off000071a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71A9 18764 bytes
SHA-256: 19eb0a1aeef998e7db468722215b94b9b4bc3d0fba007f3cca2c49ee7cc94cee

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