Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d884b460e2da8c…

MALICIOUS

PDF

43.9 KB Created: 2021-06-03 05:23:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 232d5a2907391b587e5383415556dd0e SHA-1: d5bb48fc96152a5ef5af876d4d979435fb17a8dd SHA-256: d4d884b460e2da8c1ac145adc4b046348a560b5d1696262379b6e144c96b9dc2
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF that displays a fake CAPTCHA to lure the user into performing an action, likely to download and execute a payload. The embedded URL points to a resource that is likely malicious, and the ML classifier strongly indicated maliciousness. No scripts were extracted, but the overall pattern suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/free-face-roblox-game-hack
    • http://library.atim.ac.id/repository/free-robux-with-no-verification_GM431946152.pdf
    • http://library.atim.ac.id/repository/coin-master-free-spins-fb_GM406889139.pdf
    • http://library.atim.ac.id/repository/free-robux-codes-2021_GM431946152.pdf
    • http://library.atim.ac.id/repository/roblox-promo-codes-for-free-robux_GM431946152.pdf
    • http://library.atim.ac.id/repository/free-robux-for-kids_GM431946152.pdf
    • http://library.atim.ac.id/repository/real-free-robux-codes_GM431946152.pdf
    • http://library.atim.ac.id/repository/coin-master-mod-apk-latest-version-free-download_GM406889139.pdf
    • http://library.atim.ac.id/repository/free-minecraft-wallpaper_GM479516143.pdf
    • http://library.atim.ac.id/repository/how-to-hack-someone-on-roblox_GM431946152.pdf
    • http://library.atim.ac.id/repository/hack-coin-master-free_GM406889139.pdf
    • http://library.atim.ac.id/repository/hack-coin-master-link_GM406889139.pdf
    • http://library.atim.ac.id/repository/free-spin-link-of-coin-master_GM406889139.pdf
    • http://library.atim.ac.id/repository/coin-master-free-spins-link-2021-hack_GM406889139.pdf
    • http://library.atim.ac.id/repository/coin-master-free-cards-link_GM406889139.pdf
    • http://library.atim.ac.id/repository/coin-master-hack-spin-ios_GM406889139.pdf
    • http://library.atim.ac.id/repository/coin-master-33-hack-version-download_GM406889139.pdf
    • http://library.atim.ac.id/repository/how-to-get-minecraft-windows-10-for-free_GM479516143.pdf
    • http://library.atim.ac.id/repository/can-i-get-free-robux_GM431946152.pdf
    • http://library.atim.ac.id/repository/app-for-free-spins-on-coin-master_GM406889139.pdf
    • http://library.atim.ac.id/repository/androeed-ru-minecraft_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005153.bin
0b7292e537046374525545b11721b698f4ba770887ed5fd820c6ec63eef11cd4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5153 25172 bytes
font_01_sfnt_off0000896c.bin
89cd2a226c48b85e3fd50639e1c54ff12a7aea6a284b12bd929af74d1649954d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x896C 18176 bytes

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