Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bb7d21de043321…

MALICIOUS

PDF

36.4 KB Created: 2021-05-14 07:42:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3372179c1151615abace6171bd82349b SHA-1: b58858492d4400d6e5eb615ea9954a44af3b21db SHA-256: f4bb7d21de043321182d2f0de25b74414edd63e2778ebebce64be9e47e6ace80
60 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a prominent lure for 'Free Robux' and a 'game hack generator', directing users to a suspicious URL. This indicates a social engineering tactic to trick users into visiting a potentially malicious site. While no scripts were directly extracted, the PDF structure and embedded URI strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0292

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/i-want-free-robux-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_off00003373.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3373 24648 bytes
SHA-256: e6db92d2f121d84415b6da4433c465cf61b2ecd8ec918c545f3fc6c1e051dbb0
font_01_sfnt_off00006bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFD 18544 bytes
SHA-256: 21c84a9f4ed3b5496a815e3404d7d5cd07faeb2ee17584cb0226aa903f450845

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