Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4630e2adbabfa7…

MALICIOUS

PDF

39.2 KB Created: 2021-05-21 21:58:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5d5e35f0e2bdac95ca2f3bfc5f20a8f1 SHA-1: e869dc931a5ee724875b46d3e28d85e211133443 SHA-256: 3e4630e2adbabfa7ed20665c91e3fe62d1a6415373108c68a8149671db047246
82 Risk Score

Malware Insights

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

The document presents itself as a lure for "Free Robux Games" and contains a fake CAPTCHA, a common social engineering tactic to trick users into clicking malicious links. Several URLs pointing to game hack PDFs and a "Robux Generator" were extracted, suggesting the document's purpose is to redirect users to potentially malicious sites or downloads. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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/free-robux-games-on-roblox-game-hack
    • http://www.tucsen.net/Public/upload/editorfiles/free-arsenal-hacks_GM431946152.pdf
    • http://www.tucsen.net/Public/upload/editorfiles/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • http://www.tucsen.net/Public/upload/editorfiles/coin-master-32-android-mod-hack-apk-download_GM406889139.pdf
    • http://www.tucsen.net/Public/upload/editorfiles/roblox-phantom-forces-hack_GM431946152.pdf
    • http://www.tucsen.net/Public/upload/editorfiles/minecraft-free-ios-no-verification_GM479516143.pdf
    • https://www.roblox.co
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003215.bin
b1b6b01ebd8f1657e26511a80849ec56f9498e3255c4c3aa5163b54a95ca5a89		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3215 25780 bytes
font_01_sfnt_off00006bc3.bin
4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC3 3400 bytes
font_02_sfnt_off000076ec.bin
121d272924a8948b6bfdf19867642727f57edf659587de43eb46571e5003926c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76EC 18576 bytes

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