Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6da1272d78f587…

MALICIOUS

PDF

36.9 KB Created: 2021-05-13 05:47:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 79e10c8c4c561b18ce60b6dd9ff4a807 SHA-1: 14642f8617c628c2bff00a7dd3d958f16a9bc69a SHA-256: 7e6da1272d78f58718873ede7823bd53793a07ec9c5081ee1bd700d1d6366891
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a critical heuristic firing for a redirector link, specifically targeting users with a 'free generator / game hack' lure. The embedded URL, https://netcdn.xyz/app/431946152/blox-world-free-robux-game-hack, is identified as a malicious redirector. The document body and metadata indicate it was generated by wkhtmltopdf, suggesting it's a crafted lure rather than a typical document.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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/blox-world-free-robux-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_off00003084.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3084 27504 bytes
SHA-256: 89af16660c4e178621d7614a36034f3213600c4363385861b46f5a0ea0a64cb6
font_01_sfnt_off00006e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E67 18460 bytes
SHA-256: aacba205b02649cb17ca6db96e04e864edcc8b3535ee86ede1af231380f35ab7

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