Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da1907c86445bd6…

MALICIOUS

PDF

38.1 KB Created: 2021-05-21 15:04:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6613e02edf22f20dc11d51c6a9aa8d6d SHA-1: ae73b4d059dae036f0d4bf227d0b606886fb4598 SHA-256: 4da1907c86445bd68b7afa6f8a4b0541058f623bd448abd9132bb692781bf94b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for game hacks and free currency. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-robux-pin-codes-game-hack, which is linked from within the document body and also appears in heuristic firings. While no scripts were extracted, the document's structure and embedded links strongly suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9407

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/free-robux-pin-codes-game-hack In PDF document text
    • http://biljartenbarendrecht.nl/images/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/how-do-you-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/how-to-get-free-chest-in-coin-master_GM406889139.pdfIn PDF document text
    • http://biljartenbarendrecht.nl/images/how-to-get-roebucks-in-roblox_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_off000032e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32E7 27920 bytes
SHA-256: 7cacd78f054fc52807696eda0731f0dd060ad274a5de1958273b61b30901f4e2
font_01_sfnt_off0000731b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x731B 18464 bytes
SHA-256: 23872266a6577b01853888d52c04c526ac323517b7f86f8cb64f3b9e81653507

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