Malicious PDF — malware analysis report

Static analysis result for SHA-256 38939d800da2c4ce…

MALICIOUS

PDF

29.8 KB Created: 2021-07-31 06:40:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b95e7fad3b97c4bfb8408d826c5225c8 SHA-1: e5cc94a39db937cc82bf888edbde879820a734b8 SHA-256: 38939d800da2c4cea923ebf98e7e06ac52da140b9ed785c5b9aaa05fd1ff049d
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains heuristics indicating it's a lure for game hacks and redirects to a known malicious URL. The document body, though heavily obfuscated, contains text related to 'free Robux' and the malicious URL. This suggests the primary goal is to trick users into visiting a compromised site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0573

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/431946152/how-to-earn-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
font_00_sfnt_off0000202b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x202B 22392 bytes
SHA-256: 90f720dd9308855f363e3b4aaff6493c68b91a52be9f04ccf710dea24523cd38
font_01_sfnt_off0000520f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x520F 18592 bytes
SHA-256: 5f937b01d2564a1e5fa4c0b4366c64548c36994ef3892cbb218ece3c84f10115

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