Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0e777b3ef2f4eb…

MALICIOUS

PDF

43.9 KB Created: 2021-05-13 03:33:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fa019fb25baa10b0072d4a8082651331 SHA-1: 495a1f61667347f6337eb24d7f17f4866802fbcb SHA-256: cb0e777b3ef2f4eb64161132f195cefb2c988701d33ac564589f45b967d53805
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA or human verification prompt, disguised as a button to claim free Robux. It also embeds an external URI pointing to a URL associated with game hacks. This suggests a social engineering attack aimed at tricking users into clicking malicious links, likely to download further malware or engage in a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/claim-free-robux-button-game-hack
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/minecraft-tiktok-hacks_GM479516143.pdf
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coinmasterhack-club_GM406889139.pdf
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-spins-for-coin-master-app_GM406889139.pdf
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/roblox-studio-free-download_GM431946152.pdf
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/best-free-minecraft-skins_GM479516143.pdf
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/hack-coin-master-apk-31_GM406889139.pdf
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-apk-2021_GM406889139.pdf
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-download-today_GM406889139.pdf
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-free-spins_GM406889139.pdf
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-spins-and-coins-for-coin-master_GM406889139.pdf
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/roblox-ftw_GM431946152.pdf
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/wahoogaming-co-free-robux_GM431946152.pdf
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/robux-games_GM431946152.pdf
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/roblox-robux-hack_GM431946152.pdf
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/roblox-com-www_GM431946152.pdf
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/all-minecraft-handbooks_GM479516143.pdf
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-get-free-roblox_GM431946152.pdf
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-robux-only-username-no-human-verification_GM431946152.pdf
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-free-coins-and-spins_GM406889139.pdf
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/rblx-gg-free-robux_GM431946152.pdf
    • https://discord
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cce.bin
41aed9921d50b2669aabd5670848bb39c8177b279d9f0cd12ecfbb18af9ad35f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CCE 25816 bytes
font_01_sfnt_off00008815.bin
a65a8cc7dc4bcbd85f0772ba27416f5bddaec9beaf507a16cddd286b7aed5464		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8815 18800 bytes

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