Malicious PDF — malware analysis report

Static analysis result for SHA-256 377b6d921bc7a887…

MALICIOUS

PDF

37.5 KB Created: 2021-07-05 09:18:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 86b190162c612e9293cd708526df1a3d SHA-1: 677e1ab4dd603a90711d4bae8a69391c7a33abdb SHA-256: 377b6d921bc7a887e217bee1fbe014dd3e17c3a6d2b0972d94af35018fc20a8b
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which are presented as download opportunities for game-related cheats or hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ML classifier strongly suggests maliciousness. The primary URL http://netcdn.tw/app/406889139/master-8-ball-pool-free-coins-game-hack likely leads to a malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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.tw/app/406889139/master-8-ball-pool-free-coins-game-hack
    • http://mansatupati.my.id/__statics/gudangsoal/files/free-spin-app-for-coin-master_GM406889139.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/pokemon-go-free-like-games_GM1094591345.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/minecraft-for-ipad-free_GM479516143.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/get-minecraft-for-free_GM479516143.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/coin-master-game-2021-free-spin-link_GM406889139.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/how-to-become-hacker-in-roblox_GM431946152.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/free-valkyrie-helm-roblox_GM431946152.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins-hack_GM406889139.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/free-roblox-invitations-loadstrings-full-lua-free-no-virus_GM431946152.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/free-spins-for-coin-master-hack_GM406889139.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/how-do-u-get-robux_GM431946152.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/roblox-studio-free_GM431946152.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/roblox-bubblegum-simulator-how-to-get-the-tank-for-free_GM431946152.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/minecraft-java-edition-download-free_GM479516143.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/free-mods-for-minecraft-pe_GM479516143.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/how-to-hack-a-minecraft-server_GM479516143.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/oprewards-robux_GM431946152.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/blox-supply-free-robux_GM431946152.pdf
    • http://mansatupati.my.id/__statics/gudangsoal/files/minecraft-pe-hacks_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003145.bin
4452f1e1f535f9f17f846e000a27b9697323751561139ba08dcb284780dacee0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3145 22932 bytes
font_01_sfnt_off000064e1.bin
c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E1 2896 bytes
font_02_sfnt_off00006ec6.bin
f1c889cea97dba01ef60a47a7e02dd9d08b14b091404207e980aea824e3c74e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC6 18652 bytes

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