Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9d8af0a89887fa…

MALICIOUS

PDF

48.1 KB Created: 2021-05-17 14:07:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ab86cbb93c43f764837305eb1dd064d1 SHA-1: def77f1639f28f7cd4830c4b3d02db7fa4582725 SHA-256: 1c9d8af0a89887fad12f682a8de5d4389f4d3ad71442d86ca4d4f9b077b4966f
82 Risk Score

Malware Insights

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

The PDF document contains a lure for 'free Robux' and displays a fake CAPTCHA to trick the user into clicking a malicious link. The ML classifier also flagged this PDF as malicious. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-robux-no-human-verification-2021-game-hack, which is likely used to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-no-human-verification-2021-game-hack
    • http://ambingenieria.com/images/haktuts-coin-master-free-spin-link_GM406889139.pdf
    • http://ambingenieria.com/images/get-free-coins-on-coin-master_GM406889139.pdf
    • http://ambingenieria.com/images/flip-master-coins-hack_GM406889139.pdf
    • http://ambingenieria.com/images/coin-master-free-spins-1701-20_GM406889139.pdf
    • http://ambingenieria.com/images/coin-master-rare-cards-hack_GM406889139.pdf
    • http://ambingenieria.com/images/coin-master-cheats_GM406889139.pdf
    • http://ambingenieria.com/images/coin-master-hack-free-spins_GM406889139.pdf
    • http://ambingenieria.com/images/roblox-inappropriate_GM431946152.pdf
    • http://ambingenieria.com/images/buxblast-com-robux_GM431946152.pdf
    • http://ambingenieria.com/images/minecraft-pe-hack-client_GM479516143.pdf
    • http://ambingenieria.com/images/roblox-arsenal-hack-script-pastebin_GM431946152.pdf
    • http://ambingenieria.com/images/how-can-i-get-minecraft-for-free_GM479516143.pdf
    • http://ambingenieria.com/images/daily-spins-coin-master_GM406889139.pdf
    • http://ambingenieria.com/images/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdf
    • http://ambingenieria.com/images/free-spin-link-coin-master-app_GM406889139.pdf
    • http://ambingenieria.com/images/roblox-games-with-free-boombox_GM431946152.pdf
    • http://ambingenieria.com/images/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdf
    • http://ambingenieria.com/images/coin-master-hack-online-no-human-verification_GM406889139.pdf
    • http://ambingenieria.com/images/roblox-speed-hack_GM431946152.pdf
    • http://ambingenieria.com/images/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d6f.bin
d94ef36857c56089a62b4ebadf319a9f60631f1b958d1e2957ad1bfc34e2c60c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D6F 26844 bytes
font_01_sfnt_off000089e5.bin
9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89E5 5596 bytes
font_02_sfnt_off0000968c.bin
6a9b2633b50d097f4b127a07737bc979a0fc1726e0f4efc9f53c1be2676c3116		 pdf-font-stream PDF embedded font (sfnt) at offset 0x968C 19260 bytes

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