Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a11f2da149577a…

MALICIOUS

PDF

34.2 KB Created: 2021-06-28 04:14:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4a57eed69e73d226ae6df4b643b1c2be SHA-1: 8ffeb3353cc99bb1ff664e0385efb9d864efb86a SHA-256: 84a11f2da149577a3f1f7b47558a7329d65bc7c85497a0a52d881847e9605fbb
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The document displays a fake CAPTCHA or human verification prompt, a common lure to trick users into downloading malicious files. The embedded URL http://netcdn.co/app/431946152/roblox-popular-hacker-game-hack likely hosts a secondary payload. The ML classifier also flagged this PDF as malicious with high confidence.

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/roblox-popular-hacker-game-hack
    • https://cnc-xinrong.com.tw/image/data/files/hacks-para-roblox-2021-jailbreak-mayo_GM431946152.pdf
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdf
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-free-vip-present-on-adopt-me-roblox_GM431946152.pdf
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-free-robux-without-verifying_GM431946152.pdf
    • https://cnc-xinrong.com.tw/image/data/files/roblox-hair-for-free_GM431946152.pdf
    • https://cnc-xinrong.com.tw/image/data/files/roblox-jailbreak-money-hack-2021_GM431946152.pdf
    • https://cnc-xinrong.com.tw/image/data/files/free-minecraft-java-edition_GM479516143.pdf
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-to-village-3-in-coin-master_GM406889139.pdf
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-free-100-spin_GM406889139.pdf
    • https://cnc-xinrong.com.tw/image/data/files/minecraft-images-free_GM479516143.pdf
    • https://cnc-xinrong.com.tw/image/data/files/free-vip-server-roblox_GM431946152.pdf
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-hacks-for-android_GM406889139.pdf
    • https://cnc-xinrong.com.tw/image/data/files/how-to-hack-on-roblox-mad-games_GM431946152.pdf
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-2021-no-human-verification-or-survey_GM431946152.pdf
    • https://cnc-xinrong.com.tw/image/data/files/free-minecraft-java-edition-account_GM479516143.pdf
    • https://cnc-xinrong.com.tw/image/data/files/roblox-free-clothes-generator_GM431946152.pdf
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • https://cnc-xinrong.com.tw/image/data/files/how-to-change-your-name-in-roblox-for-free_GM431946152.pdf
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-free-robux-on-phone-2021_GM431946152.pdf
    • https://cnc-xinrong.com.tw/image/data/files/roblox-hack-scripts-pastebin_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f52.bin
082cea90850269beb89ea69741e3a526bca83f3075bb3192ab3adfd3550e17c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x2F52 22156 bytes
font_01_sfnt_off0000606e.bin
cbfb63405a972dd372431a2ed0a64d7205570a82dfc8eb8f6248162fd9225cee
pdf-font-stream PDF embedded font (sfnt) at offset 0x606E 19124 bytes