Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c0f436e1d42f62…

MALICIOUS

PDF

35.6 KB Created: 2021-06-21 17:26:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 984866acc18171c241d21fde63526144 SHA-1: 529de2268ff1ceec86a7f149e36e99f62ea11d45 SHA-256: f6c0f436e1d42f62803e067574b9c2dc47294cee72639076d5effd9a13490bed
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous embedded URLs and a document body that promotes free in-game currency for popular games, acting as a lure. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a link farm designed to attract users. The ML_NYX_PDF_MALICIOUS score of 0.998 strongly suggests malicious intent, likely to redirect users to sites hosting malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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
  • 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/how-do-u-get-free-robux-without-downloading-apps-game-hack
    • https://linhkien247.vn/public/upload/files/roblox-its-free-advert_GM431946152.pdf
    • https://linhkien247.vn/public/upload/files/cheat-command-terminal-railways-roblox-admin-pass_GM431946152.pdf
    • https://linhkien247.vn/public/upload/files/coin-master-hack-app-for-ios_GM406889139.pdf
    • https://linhkien247.vn/public/upload/files/bad-minecraft-free_GM479516143.pdf
    • https://linhkien247.vn/public/upload/files/how-to-get-free-spins-on-coin-master-game_GM406889139.pdf
    • https://linhkien247.vn/public/upload/files/how-to-get-free-coins-on-coin-master_GM406889139.pdf
    • https://linhkien247.vn/public/upload/files/how-to-hack-surf-leaderboard-roblox_GM431946152.pdf
    • https://linhkien247.vn/public/upload/files/free-minecraft-severs_GM479516143.pdf
    • https://linhkien247.vn/public/upload/files/using-cheat-engine-to-hack-roblox_GM431946152.pdf
    • https://linhkien247.vn/public/upload/files/united-gaming-net-coin-master-hack_GM406889139.pdf
    • https://linhkien247.vn/public/upload/files/copy-and-paste-free-robux_GM431946152.pdf
    • https://linhkien247.vn/public/upload/files/coin-master-apk_GM406889139.pdf
    • https://linhkien247.vn/public/upload/files/how-to-hack-coin-master-pc_GM406889139.pdf
    • https://linhkien247.vn/public/upload/files/free-robux-no-verification-no-download_GM431946152.pdf
    • https://linhkien247.vn/public/upload/files/free-spin-sites-for-coin-master_GM406889139.pdf
    • https://linhkien247.vn/public/upload/files/websites-to-get-free-robux_GM431946152.pdf
    • https://linhkien247.vn/public/upload/files/how-do-you-get-free-robux-2021_GM431946152.pdf
    • https://linhkien247.vn/public/upload/files/how-to-hack-clothes-on-roblox-2021_GM431946152.pdf
    • https://linhkien247.vn/public/upload/files/coin-master-link-for-spins_GM406889139.pdf
    • https://linhkien247.vn/public/upload/files/roblox-its-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030a4.bin
535bdf607bea01dcba5312372202bde19770c308ac942b538aefb7bf992df811
pdf-font-stream PDF embedded font (sfnt) at offset 0x30A4 22708 bytes
font_01_sfnt_off00006350.bin
341ea92600a9f51cd81a93784bf9a9c7852d4e6f4846420bae6d69c7b1e2b832
pdf-font-stream PDF embedded font (sfnt) at offset 0x6350 20060 bytes