Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d15aa42d915a7f…

MALICIOUS

PDF

35.0 KB Created: 2021-05-10 12:18:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8f31a6101474b069005cd2467b7748f6 SHA-1: f5964e8e8c136fb54627d22540f0645fbfc5b1d4 SHA-256: b2d15aa42d915a7f69327e436a5891decbb85b2e9b52e7265206e7baeeeea6f6
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically a 'game hack' lure. The document body contains text and a link that strongly suggest a phishing attempt to trick users into visiting a malicious website. The embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.0306

Heuristics 4

  • 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.
  • 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/roblox-skin-free-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
stream_003_off00002e55.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E55 24856 bytes
SHA-256: a502a7b5533eb8c90bf35d4abbddb6946d3ff4d87f9794fbc0df05dd13fc8501
font_01_sfnt_off00006782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6782 18236 bytes
SHA-256: 6f613c146b2caf8aa71dfdba399286dfcc190b8555f8633d10d72eb14be7938a

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