Malicious PDF — malware analysis report

Static analysis result for SHA-256 193f2b3f82936b13…

MALICIOUS

PDF

37.6 KB Created: 2021-05-21 11:01:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d60c5a1e186e51a9ee3ed5dfa32427e2 SHA-1: 592a937b4c0e2f2352b0e080869880dbc309f2e0 SHA-256: 193f2b3f82936b135c90d267c989d5bcf7c5244111f53edb67d6d3e1568d7ea7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generator' or 'game hack' lures. The document body also contains the URL 'https://netcdn.xyz/app/431946152/robux-free-gift-card-game-hack', which is directly associated with the malicious redirector heuristic. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/robux-free-gift-card-game-hack In PDF document text
    • http://altc.de/images/free-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://altc.de/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://altc.de/images/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://altc.de/images/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • http://altc.de/images/blox-world-free-robux_GM431946152.pdfIn 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_off000031c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31C0 27588 bytes
SHA-256: 7eeae70b98b0773de44312f0ba062ad0b34f9ebfa7544de36f9fb8e79a7eadc0
font_01_sfnt_off000070a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70A3 18640 bytes
SHA-256: 299b54e9041e0eacb2b5f4a1a09a85f1fb6c0d753f38c204f1d1c9ff56031a85

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