Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bef34be4600064d…

MALICIOUS

PDF

35.3 KB Created: 2021-06-18 03:26:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c764d4b1aafa52299233ab65cdd681b6 SHA-1: 901cc630e14eec7ca3f7398e1c4d029c87dfce0d SHA-256: 3bef34be4600064d7d291b4111284d1f166243f2ee7d63394eeb3d5b578f35bf
102 Risk Score

Malware Insights

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

The PDF document contains a direct link to download an executable disguised as a game hack, along with numerous other links to SEO-optimized PDFs. The ML classifier strongly indicates maliciousness, and the presence of a download button lure reinforces the deceptive nature of the document. The primary goal appears to be tricking the user into downloading and executing a payload from the provided URL.

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/download-roblox-cheat-engine-5.5-for-free-game-hack
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-coin-link_GM406889139.pdf
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-free-spins-and-coins-group_GM406889139.pdf
    • https://www.lincolnec.edu.np/userfiles/files/roblox-2021-hack_GM431946152.pdf
    • https://www.lincolnec.edu.np/userfiles/files/how-to-get-free-robux-codes-2021_GM431946152.pdf
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-free-coins-cheat_GM406889139.pdf
    • https://www.lincolnec.edu.np/userfiles/files/how-to-get-free-robux-promo-codes_GM431946152.pdf
    • https://www.lincolnec.edu.np/userfiles/files/how-to-cheat-in-roblox_GM431946152.pdf
    • https://www.lincolnec.edu.np/userfiles/files/how-to-hack-roblox-with-cheat-engine-2021_GM431946152.pdf
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-free-spins-today-daily-links_GM406889139.pdf
    • https://www.lincolnec.edu.np/userfiles/files/how-to-get-free-robux-on-phone-2021_GM431946152.pdf
    • https://www.lincolnec.edu.np/userfiles/files/free-magical-chest-coin-master_GM406889139.pdf
    • https://www.lincolnec.edu.np/userfiles/files/is-roblox-free-on-xbox_GM431946152.pdf
    • https://www.lincolnec.edu.np/userfiles/files/how-to-play-minecraft-for-free_GM479516143.pdf
    • https://www.lincolnec.edu.np/userfiles/files/roblox-hack-me-robux_GM431946152.pdf
    • https://www.lincolnec.edu.np/userfiles/files/free-robux-websites-that-actually-work_GM431946152.pdf
    • https://www.lincolnec.edu.np/userfiles/files/free-spins-and-coins-coin-master-link-2021_GM406889139.pdf
    • https://www.lincolnec.edu.np/userfiles/files/minecraft-texture-packs-free-download_GM479516143.pdf
    • https://www.lincolnec.edu.np/userfiles/files/robuxlove-net-free-robux_GM431946152.pdf
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-free-daily-spins_GM406889139.pdf
    • https://www.lincolnec.edu.np/userfiles/files/roblox-longest-super-fun-obby-cheats_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003114.bin
f971907390f505d650d99b47c52f2690b0d3b2e6a87d2813571a13f2fa246ea5
pdf-font-stream PDF embedded font (sfnt) at offset 0x3114 22420 bytes
font_01_sfnt_off0000636c.bin
888508e1ae772be5f5e1ac04ce2c3b3a60ece77492e06a865b42261413412429
pdf-font-stream PDF embedded font (sfnt) at offset 0x636C 19560 bytes