Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3441b86d7e49058…

MALICIOUS

PDF

38.4 KB Created: 2021-05-21 13:38:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a91a8d3e0a68baf54e8507ea4a484d0d SHA-1: e7c57667f3b62618d283d2fcc0e5c9c9f6f0c10c SHA-256: d3441b86d7e490586e62c36d94d341e218ebdd4c7eb5ef68e243227be73d4ce2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with themes like "Roblox Gift Card Online Free" and "game hack". The primary malicious URL identified is https://netcdn.xyz/app/431946152/roblox-gift-card-online-free-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack designed to lead the user to a malicious site, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

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/roblox-gift-card-online-free-game-hack In PDF document text
    • http://www.alpaca-buitensport.nl/images/coin-master-hack-tool-pc-download_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-coin-master-spins-link_GM406889139.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_off00003416.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3416 27496 bytes
SHA-256: 1455cbf9d6a79ce3671ed5e8d45cbf64d125f3fe8a48aa68749e8dcedcde46fe
font_01_sfnt_off00007415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7415 18572 bytes
SHA-256: df9893eb1f0d0b90ef1012123e626362df07f41b7e954edba7018aa352f9b9fa

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