Malicious PDF — malware analysis report

Static analysis result for SHA-256 f343305776816b87…

MALICIOUS

PDF

34.4 KB Created: 2021-05-10 11:01:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d6b025fbe7b73650b26b9262af479f80 SHA-1: 44f6b2fffadd9ab372af9fcd6a2df8554392c764 SHA-256: f343305776816b873c50c83a3d8f6ff406a7ceed8276a88384c70ba08a9f0fb6
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically advertising a 'free generator' for a game. The document body and metadata indicate it was generated by wkhtmltopdf, suggesting it might be a crafted lure. The primary malicious IOC is the redirector URL used in the lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0319

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/get-free-food-in-coin-master-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_off00002f66.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F66 24048 bytes
SHA-256: 3c85a7386f9dbe82b7ae069c22437bf73ed5e7456dc0b8ed795c7699cd5dc9fc
font_01_sfnt_off00006634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6634 17884 bytes
SHA-256: 9e8203a117569d62088e0d60748e14aeb3e41c3201478a2ae4f054b44a03d8f3

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