Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e887ac881d6fdfd…

MALICIOUS

PDF

34.8 KB Created: 2021-07-09 23:47:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e715bc4c3ea67dd1b0766a70de06e8d0 SHA-1: ead11a096b3d37aa0d7a0bbd6a70be6820e2c7c3 SHA-256: 2e887ac881d6fdfdf2224d059bf76ea101b9ab2dac62f239c5f46a6155fba654
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick users into clicking a link, which is a common social engineering tactic. The embedded URL points to a resource likely designed to deliver a second-stage payload. While no scripts were explicitly extracted, the PDF structure and heuristics suggest an attempt to exploit the user's interaction to execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/431946152/password-free-roblox-accounts-game-hack
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/minecraft-tiktok-hacks_GM479516143.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/robuxmatchcon_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/apps-to-get-minecraft-for-free_GM479516143.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-change-your-roblox-name-for-free-2021_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/easy-free-roblox-today_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/spin-links-for-coin-master_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-robux-no-human-verification-2021_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-hack-mod-apk-android-1_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-get-free-robux-without-any-verification_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-hack-spins-app_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/get-free-coin-master-coins_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/hack-counter-blox-roblox-offensive-download_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/can-your-roblox-account-get-hacked-by-cookies_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/roblox-place-view-bot-hack-forms_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-50-spin-link_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-get-free-robux-inspect-element-no-waiting2021_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/hack-roblox-troll-gui_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000325e.bin
efd43c2856750ad06af1c682fcb7a1bb1280eea2797b0fe10bc3e45bb45a20a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x325E 21612 bytes
font_01_sfnt_off000061bd.bin
03117f35e26f952280f1a86eaf9dd12b6f6c2ed6461e2b7a08b69775d2729496		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BD 19384 bytes

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