Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f4c47804199a56…

MALICIOUS

PDF

34.6 KB Created: 2021-06-28 20:35:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4ee385549e1b82938a987ea657ae40fa SHA-1: ac37092d06f0ade59d3dd43b67ef3de9d1d51aed SHA-256: b4f4c47804199a56066efbd372f632cbd443a7d2ab0aabb09dae1dce35336c73
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is a malicious redirector lure, specifically impersonating brands like Apple and using game-related themes to entice clicks. The primary URL, http://netcdn.co/app/431946152/roblox-free-download-no-sign-up-game-hack, is flagged as malicious and part of a redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to lead the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.co/app/431946152/roblox-free-download-no-sign-up-game-hack.
  • 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/roblox-free-download-no-sign-up-game-hack In PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/how-to-get-free-admin-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/roblox-studio-how-to-make-a-free-robux-game_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/veorra-set-free-roblox-id_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-rs-500-roblox_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-draw-roblox-hack_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/how-to-make-a-computer-hacking-in-roblox_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/roblox-hacks-lua-vs-lua-c_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-vip-codes-for-roblox_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/roblox-hack-pet-simulator_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/roblox-music-gui-hack_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/cheats-for-roblox-high-school_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/roblox-lua-script-gear-giver-hack_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/como-conseguir-robux-con-hacks_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/how-to-get-free-robux-no-3-easy-steps_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-robux-app-hack_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/coin-master-spin-hack_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
font_00_sfnt_off00003088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3088 21852 bytes
SHA-256: 2d6d532c425add0d03a40191698a72f86bc34f4bcf8e5c55a1bc2e06fad29a8c
font_01_sfnt_off00006104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6104 19452 bytes
SHA-256: 8e83d216f1d2baff05c7f0fde77fb6a58d6abdf7830379119bfdebad511036e5

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