Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf0b94d60986f1d…

MALICIOUS

PDF

32.7 KB Created: 2021-07-20 00:18:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1f45d43ed29d1b2d9ea87a54befcc23f SHA-1: 9109fc965d208f6445c45d5e87928ae8bb623b4f SHA-256: fdf0b94d60986f1d04f790b6b8fc642e5ac0debcfc88d5ffb577f29ab5432a2e
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and embedded links, indicating an attempt to trick the user into clicking a malicious URL. The primary URL, http://netcdn.tw/app/406889139/free-coin-master-spins-game-hack, is likely used to deliver a secondary payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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 http://netcdn.tw/app/406889139/free-coin-master-spins-game-hack
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/minecraft-java-edition-code-free_GM479516143.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/was-minecraft-ever-free_GM479516143.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-minecraft-account-and-password_GM479516143.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-minecraft-server-maker_GM479516143.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/minecraft-com-free_GM479516143.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/daily-free-spins-for-coin-master_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-robux-come_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-minecraft-mods_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000029be.bin
14ed2a5d3095f721bebcd3465fdc8363b0da2ecb208fb0d90db492ab1053f1a5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x29BE 23504 bytes
font_01_sfnt_off00005eed.bin
dbba0adc3b1b7bb8b2e5e51fec5d28ab169e2f7a165ed2a14d616932af559aea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EED 17884 bytes

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