Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42826c659485f49…

MALICIOUS

PDF

37.3 KB Created: 2021-05-16 14:38:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4cb9dc904cce3cccffe02128a50d77b2 SHA-1: 53dbad93e00d8de95587e14d2093e0606ecc4c73 SHA-256: d42826c659485f49937f9546eee20c72c4911c4dde5bf37e722353bcd192401b
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing indicating it links to a malicious redirector disguised as a 'free generator / game hack' for Roblox. The document body also contains the URL and a call-to-action phrase, reinforcing the lure. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely leading to a phishing site or malware download.

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/www-roblox-com-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_off00003466.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3466 25388 bytes
SHA-256: 56ba8a75b6cdf98551e11d1dc030065ec26fd1a3d62e84d1d4a8a6029b247a39
font_01_sfnt_off00006f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F19 18708 bytes
SHA-256: 62c028800c68fb05578d3bf96b402573c397accdba69624e3c020ffc1692f811

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