Malicious PDF — malware analysis report

Static analysis result for SHA-256 4407e7544658062f…

MALICIOUS

PDF

48.9 KB Created: 2021-06-11 12:07:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9d182e7b20d227055ab4f07b463988c2 SHA-1: d496cc2dfab556fa33181f3226aeb627a150d50d SHA-256: 4407e7544658062f733c02ae999e0d934d95ba0c7184e327434feefff7f076cf
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The document displays a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking malicious links. The embedded URL, https://netcdn.tw/app/431946152/robux-hack-zero-game-hack, likely leads to a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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-hack-zero-game-hack
    • http://hardbit.cn/images/free-robux-generator-robuxian_GM431946152.pdf
    • http://hardbit.cn/images/free-robux-no-human-verification-or-survey_GM431946152.pdf
    • http://hardbit.cn/images/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdf
    • http://hardbit.cn/images/coin-master-cards-hack_GM406889139.pdf
    • http://hardbit.cn/images/synapse-roblox-free_GM431946152.pdf
    • http://hardbit.cn/images/roblox-admin-hack_GM431946152.pdf
    • http://hardbit.cn/images/inject-hack-robux-2021_GM431946152.pdf
    • http://hardbit.cn/images/hack-coin-master-ios-download_GM406889139.pdf
    • http://hardbit.cn/images/coin-master-hack-android_GM406889139.pdf
    • http://hardbit.cn/images/supreme-t-shirt-roblox-free_GM431946152.pdf
    • http://hardbit.cn/images/free-tiktok-views-no-verification_GM835599320.pdf
    • http://hardbit.cn/images/free-coin-master-spin-daily-link_GM406889139.pdf
    • http://hardbit.cn/images/free-robux-without-downloading-anything_GM431946152.pdf
    • http://hardbit.cn/images/free-coin-master-stuff_GM406889139.pdf
    • http://hardbit.cn/images/free-minecraft-gift-card_GM479516143.pdf
    • http://hardbit.cn/images/free-roblox-website_GM431946152.pdf
    • http://hardbit.cn/images/how-to-use-roblox-cheat-engine-64_GM431946152.pdf
    • http://hardbit.cn/images/free-roblox-avatar-ideas_GM431946152.pdf
    • http://hardbit.cn/images/free-hd-rainbow-template-roblox_GM431946152.pdf
    • http://hardbit.cn/images/roblox-paintball-cheat-codes_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051ee.bin
f322173bd338aa4e13d67e9996a3e28cefe87295519e70c2ef632a6b2e7227ca		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51EE 26552 bytes
font_01_sfnt_off00008efe.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EFE 5696 bytes
font_02_sfnt_off00009c10.bin
75a6bcbbf9d167f44a7b6d32048955e677e1ad0ad15df193808daa7f2ca75cda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C10 18340 bytes

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