Malicious PDF — malware analysis report

Static analysis result for SHA-256 867d9adef996b1dc…

MALICIOUS

PDF

52.4 KB Created: 2021-06-07 15:02:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 741cfad5a86238105e0556ca4e4298b0 SHA-1: 20284908588b58796a6e07126704a60a38be423a SHA-256: 867d9adef996b1dc6a98538bfc7f395109eb6461af69365da9599c5c85cb1f74
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with the document. It also embeds external URLs, one of which is `https://netcdn.tw/app/431946152/robux-free-pw-game-hack`, likely serving as a download link for a malicious payload. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9586

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/robux-free-pw-game-hack
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/coinmaster-spin-ml-free_GM406889139.pdf
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/free-coin-master-spins-without-human-verification_GM406889139.pdf
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/free-spins-coin-master-app-ios_GM406889139.pdf
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/coin-master-hack-tool-v1-9-download-free_GM406889139.pdf
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/free-game-pack-coin-master_GM406889139.pdf
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/robux-matchcomfree-robux_GM431946152.pdf
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/kachifpro_GM406889139.pdf
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/minecraft-launcher-free_GM479516143.pdf
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/spin-coin-master-free_GM406889139.pdf
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/classic-minecraft-net-hacks_GM479516143.pdf
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdf
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/minecraft-free-apk-java-edition_GM479516143.pdf
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/coin-master-free-spins-link-today-facebook_GM406889139.pdf
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/robux-generator-com_GM431946152.pdf
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/coin-master-hack-https-coinms-net_GM406889139.pdf
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/scary-larry-roblox_GM431946152.pdf
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/how-to-get-free-roebucks_GM431946152.pdf
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/free-minecraft-svg-cutting-files_GM479516143.pdf
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/coin-master-free-soins_GM406889139.pdf
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/free-rewards-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051a2.bin
895299290077512946b2048d4e3c19ef2431ea44cc9c3d2c1a9114efe9fff3d8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A2 33424 bytes
font_01_sfnt_off00009a26.bin
b8980cdac4d025496d9fe039d8c05bb5b9bae1b804244a1f9c05e9663db72816		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A26 4660 bytes
font_02_sfnt_off0000aa37.bin
6f81aeabcf16db9148cbcb3d633f30053ad17cccc8d354f7919f42a01ca1b662		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA37 18332 bytes

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