Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d146928760810dc…

MALICIOUS

PDF

45.1 KB Created: 2021-06-10 17:44:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 92d7313ccae9a4f8e6f1a051d9cb7026 SHA-1: a4386ef6db68fbfcd64732b734d86b805b4d6ee6 SHA-256: 3d146928760810dc9a0bd336da9bcccd1294604c6455971962e97247d6542513
82 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA, a common lure to trick users into clicking malicious links. The embedded URI points to a URL associated with game hacks, further supporting the lure. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack vector appears to be social engineering via a malicious document.

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.tw/app/431946152/does-cheat-engine-execute-scripts-into-roblox-game-hack
    • http://tckontrola.hr/files/freerobuxhack-us_GM431946152.pdf
    • https://tckontrola.hr/files/how-to-hack-minecraft_GM479516143.pdf
    • http://tckontrola.hr/files/coin-master-free-spins-apk-2021_GM406889139.pdf
    • http://tckontrola.hr/files/free-to-play-minecraft-servers_GM479516143.pdf
    • https://tckontrola.hr/files/how-do-i-get-free-spins-in-coin-master_GM406889139.pdf
    • http://tckontrola.hr/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://tckontrola.hr/files/coin-master-hack-without-verification_GM406889139.pdf
    • https://tckontrola.hr/files/pubg-uc-kharidna-hai_GM1330123889.pdf
    • http://tckontrola.hr/files/coin-master-free-spin-realme-products_GM406889139.pdf
    • https://tckontrola.hr/files/coin-master-game-free-spin_GM406889139.pdf
    • http://tckontrola.hr/files/claim-free-spins-coin-master_GM406889139.pdf
    • http://tckontrola.hr/files/codes-to-get-free-robux_GM431946152.pdf
    • https://tckontrola.hr/files/roblox-bloxburg-hack_GM431946152.pdf
    • http://tckontrola.hr/files/free-robux-generator-codes_GM431946152.pdf
    • https://tckontrola.hr/files/free-games-like-minecraft_GM479516143.pdf
    • https://tckontrola.hr/files/minecraft-pe-server-hosting-free_GM479516143.pdf
    • http://tckontrola.hr/files/free-college-textbooks-tiktok_GM835599320.pdf
    • http://tckontrola.hr/files/how-to-get-free-robux-without-any-verification_GM431946152.pdf
    • http://tckontrola.hr/files/cheat-engine-hack-roblox-speed_GM431946152.pdf
    • http://tckontrola.hr/files/free-shields-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005052.bin
c58c9d72789348632d33e484b5a3820fcfb6afa3ce0e35d6c4dcb2809c3bccb3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5052 26112 bytes
font_01_sfnt_off00008ada.bin
d2290d61d5450eadbe316b3ff2aa3a57cd8ddafb470a3f0d972fb687337cbed9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADA 19176 bytes

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