Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7ae622c754bb1a…

MALICIOUS

PDF

33.1 KB Created: 2021-06-28 16:20:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4b44cb0d4b02ee61349a9015629c9069 SHA-1: da76886c5487f2d05207d96592235357f844703b SHA-256: bc7ae622c754bb1a2602c889f42b627e43dfbebb5b30f62aac16c996a9d87f77
102 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a malicious lure, employing a "download button" heuristic and a large number of external links, many of which are SEO-optimized and point to game-related hacks. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of it being used to distribute malware or lead users to malicious sites. The primary IOCs are the external URLs, which likely serve as the entry point for further compromise.

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/roblox-bulbul-hack-game-hack
    • http://cintabaca.org/katalog/repository/how-to-hack-coin-master_GM406889139.pdf
    • http://cintabaca.org/katalog/repository/apps-for-free-robux_GM431946152.pdf
    • http://cintabaca.org/katalog/repository/coin-master-hack-app-for-ios_GM406889139.pdf
    • http://cintabaca.org/katalog/repository/free-games-on-roblox-you-can-copy_GM431946152.pdf
    • http://cintabaca.org/katalog/repository/how-to-actually-get-1-000-free-robux_GM431946152.pdf
    • http://cintabaca.org/katalog//repository/coin-master-free-spins-link-ios_GM406889139.pdf
    • http://cintabaca.org/katalog/repository/how-to-hack-any-roblox-account-2021-easy_GM431946152.pdf
    • http://cintabaca.org/katalog/repository/download-roblox-mod-apk-free-robux_GM431946152.pdf
    • http://cintabaca.org/katalog//repository/spin-rewards-coin-master_GM406889139.pdf
    • http://cintabaca.org/katalog//repository/ro-ghoul-script_GM431946152.pdf
    • http://cintabaca.org/katalog/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://cintabaca.org/katalog//repository/coin-master-game-free-play-online_GM406889139.pdf
    • http://cintabaca.org/katalog/repository/minecraft-for-free-apk_GM479516143.pdf
    • http://cintabaca.org/katalog/repository/hacking-beyond-roblox_GM431946152.pdf
    • http://cintabaca.org/katalog/repository/get-free-spins-coin-master-2021_GM406889139.pdf
    • http://cintabaca.org/katalog/repository/get-robux-today_GM431946152.pdf
    • http://cintabaca.org/katalog//repository/minecraft-hack-mod_GM479516143.pdf
    • http://cintabaca.org/katalog//repository/roblox-sexually_GM431946152.pdf
    • http://cintabaca.org/katalog/repository/how-to-use-cheat-engine-in-roblox-2021_GM431946152.pdf
    • http://cintabaca.org/katalog/repository/bleu-roblox-exploit-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_off00002ddd.bin
e09f46cf02abef9d243e15deceb755774d6b663851103d3c77ee96022a36c4bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2DDD 21608 bytes
font_01_sfnt_off00005cec.bin
903b40f2cb99f5643071d309964d8cd340446f72115c334705433edaf3821cd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CEC 18796 bytes

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