Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d49093e66704c5b…

MALICIOUS

PDF

41.7 KB Created: 2021-05-21 15:51:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7a7ac033e5c055b7b978b82585a85dfc SHA-1: 55e9071cde55dc82adeb44f34d1af82965527c9b SHA-256: 3d49093e66704c5b1d3f82c5d2b8e2fa71f69dbfdf282c26b2880a25f51a9797
82 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA or human verification prompt, a common social engineering tactic to trick users into clicking malicious links. Several URLs were extracted, including one that appears to be the primary lure for 'how to hack Roblox'. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7527

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/how-to-hack-roblox-to-get-robux-game-hack PDF link annotation
    • https://cnc-xinrong.com.tw/image/data/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/2021-roblox_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003251.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3251 30300 bytes
SHA-256: 69e24211bbbeb718c74e0636861d6031a2a20dbe5b420d466d775ce064413a09
font_01_sfnt_off0000766b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x766B 2880 bytes
SHA-256: 106de1d187d148d03f5c34a802444a7e62d93662ddf359d17cd55770c6c16081
font_02_sfnt_off0000805b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x805B 18588 bytes
SHA-256: 6723e17a0e3ea7e17da9fa5ee91cb22fe0fa4706a6f3d09ae44dda015c08872b

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