Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb81622426ed5fc…

MALICIOUS

PDF

34.3 KB Created: 2021-06-19 10:20:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: aed3dfda6c47b247a1c5b7b8948b32f9 SHA-1: 512501d25e418fbce07ed89f571d6dacbd4438ef SHA-256: afb81622426ed5fc61742b44335e93ed98851620e41c41c4cd49544f764c7c45
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, including a primary link to 'netcdn.co' which is flagged as a malicious redirector. The document body and embedded URLs suggest a lure for game-related cheats or generators, a common tactic for distributing malware. While no scripts were explicitly extracted, the PDF structure and the nature of the links indicate an attempt to redirect the user to a malicious site, likely for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/injustice-oa-roblox-hack-game-hack In PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/game-give-free-robux_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-2021-generator_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/oprewards-com-login_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/roblox-cheat-engine-august-2021_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/roblox-bux-free_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/free-roblox_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/roblox-free-clothes-girl_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/roblox-cheat-engine-robux-download_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F3E 22340 bytes
SHA-256: da5a71f1be35a648cb37be18ac3d1636472501684495ddd85d18c6fd819cacce
font_01_sfnt_off00006092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6092 19208 bytes
SHA-256: 6bb2d4c416b183c5cb058834132416148dd7b7ddb8e8b21dc4b3d58d7fe2d773

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