Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbba31714b0783b6…

MALICIOUS

PDF

49.6 KB Created: 2021-06-03 10:25:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b6b45721da7f37d224816b41df981272 SHA-1: 52b654ee7017547d0fa4c2db287540b2b1392969 SHA-256: bbba31714b0783b6b4f4b7794b7e782ece72686f51598df001043b49b0b67950
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized links for game-related cheats and hacks. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of such links, suggesting a malicious intent to drive traffic to potentially harmful content. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into downloading something. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/479516143/how-to-make-a-minecraft-java-server-for-free-game-hack
    • http://lib.mbp.ac.id/repository/free-robux-hack-no-verification_GM431946152.pdf
    • http://lib.mbp.ac.id/repository/static-moonactive-net-free-spins-coin-master_GM406889139.pdf
    • http://lib.mbp.ac.id/repository/coin-master-hacks-for-gold-cards_GM406889139.pdf
    • http://lib.mbp.ac.id/repository/how-to-cheat-in-roblox_GM431946152.pdf
    • http://lib.mbp.ac.id/repository/free-robux-generator_GM431946152.pdf
    • http://lib.mbp.ac.id/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdf
    • http://lib.mbp.ac.id/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdf
    • http://lib.mbp.ac.id/repository/how-to-play-minecraft-with-friends-for-free_GM479516143.pdf
    • http://lib.mbp.ac.id/repository/coin-master-hack-ios-apk_GM406889139.pdf
    • http://lib.mbp.ac.id/repository/minecraft-thumbnail-maker-free_GM479516143.pdf
    • http://lib.mbp.ac.id/repository/roblox-hack-ga_GM431946152.pdf
    • http://lib.mbp.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • http://lib.mbp.ac.id/repository/minecraft-realms-free_GM479516143.pdf
    • http://lib.mbp.ac.id/repository/how-to-get-free-robux-codes-2021_GM431946152.pdf
    • http://lib.mbp.ac.id/repository/how-to-get-free-clothes-on-roblox-2021-no-bc_GM431946152.pdf
    • http://lib.mbp.ac.id/repository/robux-free-com_GM431946152.pdf
    • http://lib.mbp.ac.id/repository/what-do-roblox-points-do_GM431946152.pdf
    • http://lib.mbp.ac.id/repository/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • http://lib.mbp.ac.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdf
    • http://lib.mbp.ac.id/repository/free-robux-2021-no-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053f3.bin
066536071742ff16cf435ea64e7e9ce0b86859d1ef0bfd0f6049ec6f2ad890e3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53F3 30068 bytes
font_01_sfnt_off00009575.bin
30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9575 2840 bytes
font_02_sfnt_off00009f28.bin
8dc142bc7e6132cc43f81519c448dbddadbc7e5fdd921c0c5040c748722dd43f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F28 18324 bytes

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