Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1e4203781ecf54…

MALICIOUS

PDF

33.9 KB Created: 2021-07-06 21:46:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: abc8484f521f4b2713980f1db5fd19ad SHA-1: ddd51574a40919f2d61e91b8f17614ba9da84e3d SHA-256: 8d1e4203781ecf54de6c3a132066c10c68824c87c03768a5d2e106ac56ae22d5
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 structured as SEO-optimized URLs pointing to sites offering game cheats and free in-game currency. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports this. The document body and extracted URLs suggest a lure to phishing or malware-hosting websites.

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.tw/app/431946152/what-do-roblox-points-do-game-hack
    • http://perpustakaan.bkkbnkaltim.id/repository/how-to-get-free-minecraft-windows-10_GM479516143.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/master-coin-free-spin_GM406889139.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-without-verify_GM431946152.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/get-free-spins-coin-master-2021_GM406889139.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/minecraft-bedrock-edition-hacks_GM479516143.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-free-spins-haktuts_GM406889139.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/axe-hacks-in-roblox-in-bee-swarm_GM431946152.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-giveaway-2021-live_GM431946152.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/free-coins-coin-master-ios_GM406889139.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-ios-hack-download_GM406889139.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/le-hackean-jugando-a-roblox_GM431946152.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/promo-code-free-robux_GM431946152.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/www-roblox-robux_GM431946152.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/roblox-hack-com_GM431946152.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/is-it-possible-to-hack-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002daa.bin
d81f20e0c89157e22f08110f0044a8de5d128302ce8883a267da805df8a13143		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2DAA 22004 bytes
font_01_sfnt_off00005e45.bin
973ccab729b01203ee59feaca07c871b44131ad73a0d20edb39373357cce7c1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E45 19396 bytes

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