Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86ff9ab53b20b37…

MALICIOUS

PDF

34.0 KB Created: 2021-07-10 02:42:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 43170b736fd25471c8ca198da08d86cb SHA-1: 6b50b751d2762d8b78da7bf4ac0d6b8b9220548d SHA-256: c86ff9ab53b20b3791f6ff741423f571899c99b8c0638bc0cb83ece362a33035
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically advertising a "free generator / game hack" for Minecraft. This link, http://netcdn.tw/app/479516143/minecraft-build-hacks-game-hack, is known to lead to malicious infrastructure. The document body also contains similar lures and embedded URLs, reinforcing the phishing and redirection attempt. No scripts were extracted, but the presence of embedded URLs and the nature of the lure suggest a phishing attack designed to lead users to potentially harmful sites.

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.tw/app/479516143/minecraft-build-hacks-game-hack In PDF document text
    • https://www.ocic.hr/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/hack-team-roblox_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/roblox-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/roblox-com-download-free_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.ocic.hr/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/robloxfun-com-generator_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/ninja-legends-roblox-hacks-pet_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.ocic.hr/files/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/cheat-codes-for-ben-10-universal-showdown-roblox_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/roblox-prison-life-gui-hacks_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/avatar-animation-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/minecraft-items_GM479516143.pdfIn PDF document text
    • http://www.ocic.hr/files/ninja-legends-roblox-script-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/free-robux-site_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/javascript-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • http://www.ocic.hr/files/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://www.ocic.hr/files/coin-master-daily-free-spins-and-coins_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_off00003060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3060 22316 bytes
SHA-256: 0c0e871f3b8c5f175f555443d5698c73421adb30c3b3ef4ae5ba26f6c5b713c5
font_01_sfnt_off0000617b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x617B 18628 bytes
SHA-256: a4fd7a8a6c31dcfbd5d524261ca24fbd66144d88575524e109ec8b87e7a5b6d6