Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc8a089021bd2d9…

MALICIOUS

PDF

34.3 KB Created: 2021-06-20 01:15:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7aac605885438de0e0edcfb0d5aeeda0 SHA-1: d3852c1cc90802ec09e87f2c546c2cf2a0241a92 SHA-256: 3bc8a089021bd2d91315dffac137374290a4f8d58cfadcb8ece225b335df7361
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors, specifically advertising free game hacks and currency for popular games like Roblox and Minecraft. The ML classifier also flagged this PDF as malicious. The embedded links likely lead to further malicious content or phishing pages designed to trick users into downloading malware or divulging credentials.

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/extaf-live-roblox-free-robux-game-hack In PDF document text
    • http://unilin21.ru/images/roblox-uploader-for-free_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/roblox-free-30-robux_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/new-roblox-rc7-cracked-hack-exploit-2021_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/robuxy-com-generator_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/lua-scripting-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/50-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-club-hack_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/pubg-uc-mod-2021_GM1330123889.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/bandit-roblox-free_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/bird-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/roblox-ghost-simulator-cheat_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
font_00_sfnt_off00002f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F16 22372 bytes
SHA-256: 7e94c8a73da580012e9d49fc8344f5abd4447de0968d1aab23c92d25697c4ba8
font_01_sfnt_off000060be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60BE 19128 bytes
SHA-256: 154364f1a6e47066f899bfe35e7caf25fd01824b3be5ef61aad956f29da03f56