Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4437165b34b509a…

MALICIOUS

PDF

44.2 KB Created: 2021-05-11 05:31:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 06686ba140125c7d0b2c03192ec7eacc SHA-1: 246a58571df01e47f01511e4144a0f96e4c9266c SHA-256: b4437165b34b509aa28cedfb08b0611f7e06aff811c563a60ebbf56d3012a05a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a document body that lures users with promises of "free Robux" and game-related items. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, and the ML_NYX_PDF_MALICIOUS score is very high, suggesting malicious intent. The primary goal appears to be directing users to potentially malicious websites or scam pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.xyz/app/431946152/free-robux-for-free-game-hack
    • http://elib-sd.msj.mis.sch.id/library/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdf
    • http://elib-sd.msj.mis.sch.id/library/repository/free-roblox-com_GM431946152.pdf
    • http://elib-sd.msj.mis.sch.id/library/repository/free-redeem-code-for-coin-master_GM406889139.pdf
    • http://elib-sd.msj.mis.sch.id/library/repository/coin-master-100-spin_GM406889139.pdf
    • http://elib-sd.msj.mis.sch.id/library/repository/coin-master-hack-no-verification-ios_GM406889139.pdf
    • http://elib-sd.msj.mis.sch.id/library/repository/free-spin-and-coin-links_GM406889139.pdf
    • http://elib-sd.msj.mis.sch.id/library/repository/roblox-free-items-glitch_GM431946152.pdf
    • http://elib-sd.msj.mis.sch.id/library/repository/free-spin-link-for-coin-master-game_GM406889139.pdf
    • http://elib-sd.msj.mis.sch.id/library/repository/how-to-get-free-robux-on-chromebook_GM431946152.pdf
    • http://elib-sd.msj.mis.sch.id/library/repository/free-robux-hack_GM431946152.pdf
    • http://elib-sd.msj.mis.sch.id/library/repository/coin-master-hack-tool-v1-9-pc_GM406889139.pdf
    • http://elib-sd.msj.mis.sch.id/library/repository/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdf
    • http://elib-sd.msj.mis.sch.id/library/repository/get-gold-coin-master-village-hack_GM406889139.pdf
    • http://elib-sd.msj.mis.sch.id/library/repository/roblox-gift-card-free-codes_GM431946152.pdf
    • http://elib-sd.msj.mis.sch.id/library/repository/can-i-get-minecraft-for-free_GM479516143.pdf
    • http://elib-sd.msj.mis.sch.id/library/repository/free-robux-app_GM431946152.pdf
    • http://elib-sd.msj.mis.sch.id/library/repository/can-you-actually-get-free-robux_GM431946152.pdf
    • http://elib-sd.msj.mis.sch.id/library/repository/get-free-robux-2021_GM431946152.pdf
    • http://elib-sd.msj.mis.sch.id/library/repository/get-free-spins-coin-master-link_GM406889139.pdf
    • http://elib-sd.msj.mis.sch.id/library/repository/haktuts-coin-master-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a2b.bin
41a97a20c8b6c24ec2070ee5c398954cf2b5896b0e38cbf2938a571e5e0a9135		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A2B 29424 bytes
font_01_sfnt_off00008b56.bin
3ef9e48aa3d97d4217e004f7625a8cbae9320a74231b80a01553f6433e422360		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B56 18012 bytes

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