Malicious PDF — malware analysis report

Static analysis result for SHA-256 377dbd944b3eb466…

MALICIOUS

PDF

31.6 KB Created: 2021-07-22 17:15:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 765c9f9c9e89600f5935e63d044e1e60 SHA-1: 399f00e3fabcd7b2c04c60516db93407524bf22f SHA-256: 377dbd944b3eb46684b7a19a06cd9dc2fed6f3b35d3a83531050117099eab3ad
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a game hack redirect lure, pointing to a URL that is also flagged as a malicious redirector. The document body and embedded artifacts further reinforce this by displaying the lure text and the target URL. This suggests the primary goal is to trick the user into visiting the malicious URL, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0621

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 http://netcdn.tw/app/406889139/coin-master-15-free-spin-link-of-last-5-days-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_002_off0000241c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x241C 23412 bytes
SHA-256: f8dd1da138febf6f700dfc02d709edd02259aa265046d8fd0770dee2aa7c7e36
font_01_sfnt_off0000591f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x591F 18644 bytes
SHA-256: 4144dbe1534d0325d37e4c6129895ddb34a2bc26123e242025982d4ceef1bd2b

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