Malicious PDF — malware analysis report

Static analysis result for SHA-256 123c5589d2143b5f…

MALICIOUS

PDF

40.7 KB Created: 2021-05-21 10:03:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: be831cca9f1f6d4103dfe85b885df126 SHA-1: 335e81c9440d510289e64deda1fbc4f9aa378808 SHA-256: 123c5589d2143b5fd555c03437f6f1162111d6be43d378001826d3a045b3b494
82 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA and a "Click here to download" lure, aiming to trick users into clicking malicious links related to "hacking" Roblox accounts. The embedded URLs point to suspicious domains, and the ML classifier flagged the PDF as malicious, indicating a likely attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7129

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-a-roblox-account-2021-game-hack
    • http://pesok-rk.ru/images/pubg-2021-uc_GM1330123889.pdf
    • http://pesok-rk.ru/images/roblox-rape_GM431946152.pdf
    • http://pesok-rk.ru/images/coin-master-card-hack-apk_GM406889139.pdf
    • http://pesok-rk.ru/images/free-robux-hack-generator_GM431946152.pdf
    • http://pesok-rk.ru/images/roblox-free-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000323e.bin
074e7940788199cc9b5c2a92a239bb76bf94756f2bb4e62644da036b257ed56b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x323E 25692 bytes
font_01_sfnt_off00006e14.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E14 5696 bytes
font_02_sfnt_off00007b25.bin
aeef6a7714c6357f73dd4bac3524810632f54ab1d1528492d13c90d39421ba58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B25 18992 bytes

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