Malicious PDF — malware analysis report

Static analysis result for SHA-256 3881ef8ca896e039…

MALICIOUS

PDF

35.4 KB Created: 2021-06-26 09:15:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6ed35f266604bb1e035aa42b8a6cc97f SHA-1: 2b8d85d2778e1c689318e7fafa6d6b9e3aecf4a8 SHA-256: 3881ef8ca896e0392471b87ac790bcb8a26f45e20ef87305f53e536252772f3c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a high-severity heuristic firing for a game hack redirect lure, pointing to a suspicious URL. The document body also contains this URL, reinforcing the lure. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern involves tricking users into clicking a link that promises free game items, likely leading to malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-followers-on-roblox-generator-game-hack PDF link annotation
    • https://luyenthitoanpro.com/public/upload/files/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/roblox-cheats-for-mac_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/coin-master-cards-free_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/free-robux-limited-time-game_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/coin-master-100-spin-slot_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/fly-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/my/tasksIn 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_off0000331a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x331A 22648 bytes
SHA-256: 3ce908488ad92f9ce64f0d12f340024be38638c29186c3888cc089749d27701a
font_01_sfnt_off000065c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65C2 18920 bytes
SHA-256: 6582b8fb6e06874795b030d86f1b5ae79e244053d12aa22acdd0e576ef7835d1