Malicious PDF — malware analysis report

Static analysis result for SHA-256 177f4d637a0bb2c3…

MALICIOUS

PDF

44.7 KB Created: 2021-06-13 16:59:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 690fe0d54346987e632b09cabcf58ff8 SHA-1: e81986e5e5d3cf23f1b9d370b423cb794f2d34f0 SHA-256: 177f4d637a0bb2c350f65efe93e0891d15db92bb7e19b1c32d141c4c33d85af9
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample presents a fake CAPTCHA lure, encouraging the user to click a link to download a file. The embedded URL points to a resource that likely hosts a malicious payload. The ML classifier also flagged this PDF as malicious with high confidence.

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 http://netcdn.co/app/431946152/best-free-roblox-t-shirt-hoodie-game-hack
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-hack-to-get-robux_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/apk-coin-master-hack_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-get-a-free-dominus-in-roblox_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-ultra-attack-hack_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/roblox-hack-site_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/get-free-cards-for-coin-master_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-can-you-get-minecraft-for-free_GM479516143.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-15-free-spin-link-today_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/but-link-says-free-robux_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-spin-hack-2021_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-spins-and-coins-com_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/minecraft-free-version_GM479516143.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/is-minecraft-free_GM479516143.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-get-your-roblox-account-back-from-a-hacker_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/roblox-microsoft-rewards_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/pokemon-go-free-walk-android_GM1094591345.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-robux-hack_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/toolbox-for-minecraft-pe_GM479516143.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-hack-online_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/si-un-hacker-te-sigue-en-roblox-te-puede-hackear_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000526d.bin
375094f431269d5fc6aea94dc0184e8f8511d5d5887671be0ab7e8f8aa3bb8ac		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x526D 24644 bytes
font_01_sfnt_off00008b32.bin
ef9a8fab11e8eba971897f9163278f4468a2855807712d2410536b5ed1a20ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B32 18548 bytes

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