Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4c420b000f7762…

MALICIOUS

PDF

33.7 KB Created: 2021-06-28 03:42:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9e5b1ccca1f8b18a3cb1ab7c8e270966 SHA-1: 85b3fdd18630a1384103d2bf752fd8bc2351a5a1 SHA-256: 9c4c420b000f77621cbc890527c38ecf91cb41c3873eef6feeae634b078ad06f
102 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded URLs, many of which are structured as SEO-optimized links pointing to sites offering 'free Robux' or game hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of such links, and the ML classifier strongly suggests maliciousness. The document body, though partially garbled, also contains references to these lures and external URLs, reinforcing the phishing or scam attempt.

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/i-got-this-t-shirt-for-free-roblox-game-hack
    • http://akademiatenisa.org/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdf
    • http://akademiatenisa.org/images/stella-download-roblox-hack_GM431946152.pdf
    • http://akademiatenisa.org/images/free-robux-scams_GM431946152.pdf
    • http://akademiatenisa.org/images/games-to-get-free-robux_GM431946152.pdf
    • http://akademiatenisa.org/images/get-free-robux-without-doing-anything_GM431946152.pdf
    • http://akademiatenisa.org/images/can-you-sell-shirts-for-free-in-roblox_GM431946152.pdf
    • http://akademiatenisa.org/images/hacked-client-for-minecraft-bedrock_GM479516143.pdf
    • http://akademiatenisa.org/images/how-to-get-free-robux-and-keep-it-youtube_GM431946152.pdf
    • http://akademiatenisa.org/images/how-to-get-free-robux-without-verification_GM431946152.pdf
    • http://akademiatenisa.org/images/to-pokemon-go-free-download_GM1094591345.pdf
    • http://akademiatenisa.org/images/how-to-cheat-in-roblox-basewars_GM431946152.pdf
    • http://akademiatenisa.org/images/coin-master-free-spins-app-android_GM406889139.pdf
    • http://akademiatenisa.org/images/roblox-maid-paintball-2-free-robux_GM431946152.pdf
    • http://akademiatenisa.org/images/robux-free-online_GM431946152.pdf
    • http://akademiatenisa.org/images/xbox-one-roblox-cheats_GM431946152.pdf
    • http://akademiatenisa.org/images/coin-master-free-link-today_GM406889139.pdf
    • http://akademiatenisa.org/images/robux-com-free_GM431946152.pdf
    • http://akademiatenisa.org/images/minecraft-dungeons-free-download_GM479516143.pdf
    • http://akademiatenisa.org/images/free-400-spins-coins-master_GM406889139.pdf
    • http://akademiatenisa.org/images/how-do-u-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e71.bin
bc652686e896e04ab19291836927903f7c874289419e2c76d633de29bc4eba2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2E71 21924 bytes
font_01_sfnt_off00005e83.bin
8809230d829519474d0abe41a0aaa442d0df7237a01ea04b7a2a3445733fdf50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E83 19076 bytes

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