Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff6a12b671445b5…

MALICIOUS

PDF

36.5 KB Created: 2021-05-22 06:37:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e096ef90b942dc65982bf6d20af8b4ba SHA-1: 66c86affadcdb0ff35131b8b67e08eaad02a5215 SHA-256: bff6a12b671445b5bffc226731ee1f02060b2a735f1cb48a7811a31f9fe8a811
82 Risk Score

Malware Insights

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

The PDF document contains a lure for free Robux, presenting a fake CAPTCHA or human verification prompt to trick the user into clicking a malicious link. This link, 'https://netcdn.xyz/app/431946152/how-to-get-free-robux-2021-easy-game-hack', likely leads to a second-stage payload download. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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-get-free-robux-2021-easy-game-hack
    • https://naturenz.vn/public/files/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdf
    • https://naturenz.vn/public/files/how-to-get-free-skins-in-minecraft_GM479516143.pdf
    • https://naturenz.vn/public/files/get-free-spins-for-coin-master_GM406889139.pdf
    • https://naturenz.vn/public/files/how-to-hack-and-get-free-robux_GM431946152.pdf
    • https://naturenz.vn/public/files/hack-coin-master-game-apk_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000032e5.bin
ea8422c40daff6979560223051bf682fda7a0720186c7299c0885f4900cd8844		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32E5 24356 bytes
font_01_sfnt_off00006a89.bin
cc4041fc50bd2ea9a1268967e32916156e3a634973a216864dd7f220ceb04504		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A89 19092 bytes

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