Malicious PDF — malware analysis report

Static analysis result for SHA-256 56801115cc3dd4e3…

MALICIOUS

PDF

35.9 KB Created: 2021-06-19 01:31:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a8a884f3f9fd8b84c55495332595823f SHA-1: ab111d57223f3af3dc72acf307b1b2d46336c270 SHA-256: 56801115cc3dd4e3e967547711d5c1966214bba0da66e926dfc9a52533112d68
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick users into interacting with malicious links, a common social engineering tactic. The embedded URLs point to sites offering 'free' game-related content, likely as a lure for downloading unwanted applications or engaging in scams. No scripts were extracted, but the presence of multiple external URIs and the fake CAPTCHA heuristic strongly suggest a phishing or scam attempt.

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.co/app/431946152/free-roblox-codes-august-2021-game-hack
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/coin-master-daily-free-spin-app_GM406889139.pdf
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/minecraft-server-hacks_GM479516143.pdf
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-tiktok-likes-and-followers_GM835599320.pdf
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/coin-master-claim-spins_GM406889139.pdf
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/apps-to-get-minecraft-for-free_GM479516143.pdf
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-account-roblox-with-robux_GM431946152.pdf
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-robux-thumbnail_GM431946152.pdf
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdf
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/hackear-coin-master-android_GM406889139.pdf
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/wurst-client-18-9_GM479516143.pdf
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/coin-master-hack-spin-generator_GM406889139.pdf
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-robux-gift-card_GM431946152.pdf
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/how-to-get-roblox-premium-for-free_GM431946152.pdf
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/minecraft-xbox-360-free_GM479516143.pdf
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/roblox-game-free-download_GM431946152.pdf
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/websites-to-get-free-robux_GM431946152.pdf
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-for-doing-nothing_GM431946152.pdf
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/r67-roblox-hack_GM431946152.pdf
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-robux-hacker-us_GM431946152.pdf
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000349e.bin
6609b97f93bf4e4230264dbc98e2c99d8effb17ec8ad2d48f0daca0717fa6989		 pdf-font-stream PDF embedded font (sfnt) at offset 0x349E 22148 bytes
font_01_sfnt_off000065fe.bin
8bf06ce0b1049ac1367e92e4e65b11049a63ee4e47dbc8a5fe22f52d03c7311f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65FE 19472 bytes

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