Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4ff1bf3dc5f7ab…

MALICIOUS

PDF

35.6 KB Created: 2021-05-12 23:45:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 95f27caadfa81afb092c53b4102de4d5 SHA-1: 914c1743be761a38dc8f57ebb97639c98c6e889d SHA-256: bb4ff1bf3dc5f7ab9c21aac0ad71718ce4beca69d2ffd0a71c82f3251949de39
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically targeting users with a lure related to a game hack generator. The embedded URL, https://netcdn.xyz/app/406889139/coin-master-rewards-app-game-hack, is identified as malicious infrastructure. The document body also contains text and links reinforcing this lure, and a heuristic for a visual download button further supports the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier clean score 0.0265

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/406889139/coin-master-rewards-app-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_off00003211.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3211 24388 bytes
SHA-256: 83ff7238967f445720ad8f888896d7919259d40124375ab52968d888812526fe
font_01_sfnt_off00006a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A36 18060 bytes
SHA-256: 1ace4c7085401291f58e102c272718a2ec9341f0a4396f264039734a0ad902b6

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