Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5df8c334d167c1a…

MALICIOUS

PDF

41.9 KB Created: 2021-05-16 13:44:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-27
MD5: b31a930442b43614126a381a8930a0a0 SHA-1: d1ee6bae3090074a9cde8c1af19e3d9cffb4610c SHA-256: c5df8c334d167c1a4d7d4782806617a94d3ebb7c4efffba6822fdff85a281b18
220 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/freerobux-co-game-hack In PDF document text
    • http://lakomat.by/images/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lakomat.by/images/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lakomat.by/images/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • http://lakomat.by/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://lakomat.by/images/coin-master-hack-spin-160-pro_GM406889139.pdfIn PDF document text
    • http://lakomat.by/images/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://lakomat.by/images/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lakomat.by/images/www-coin-master-hack-tk_GM406889139.pdfIn PDF document text
    • http://lakomat.by/images/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://lakomat.by/images/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://lakomat.by/images/how-to-change-your-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lakomat.by/images/free-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • http://lakomat.by/images/free-coin-app_GM406889139.pdfIn PDF document text
    • http://lakomat.by/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lakomat.by/images/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lakomat.by/images/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://lakomat.by/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://lakomat.by/images/free-robux-live_GM431946152.pdfIn PDF document text
    • http://lakomat.by/images/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://lakomat.by/images/free-robux-apps-that-work_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_003_off000046b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46B8 25836 bytes
SHA-256: e36bd208580c06af23ee18561a3887595a6a12a93cda3b0dbd1080798e3b9462
font_01_sfnt_off0000822c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x822C 18012 bytes
SHA-256: b26dee7669683be80ea9347b4d198a521f91968e5e17acfd13a86841c541343d