Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc96bd4b90570f3d…

MALICIOUS

PDF

36.1 KB Created: 2021-05-20 21:49:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c7dfbeba37609938899235476d7d55bc SHA-1: c83bd801ac5f82c6b47e6c1b9123f4acc8ad6358 SHA-256: fc96bd4b90570f3d4e6e91d729ba9552563c2698e70604fa83d1dae77b628959
82 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA or human verification prompt, a common lure for users seeking free in-game currency like 'Robux'. It contains multiple embedded URLs, including one pointing to a 'free-robux-codes' resource, which likely leads to a malicious download or phishing page. The ML classifier also flagged this PDF as malicious, supporting the assessment of a malicious intent.

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/free-robux-codes-2021-not-used-game-hack
    • http://kulturlandschaften.eu/images/coin-master-cheats-free-spins_GM406889139.pdf
    • http://kulturlandschaften.eu/images/how-to-play-minecraft-for-free-on-pc_GM479516143.pdf
    • http://kulturlandschaften.eu/images/coin-master-free-spins-daily-link-updated_GM406889139.pdf
    • http://kulturlandschaften.eu/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://kulturlandschaften.eu/images/coin-master-hack-pro-gamers_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000316d.bin
4cc0f016470f3bef1e4d417a2ae432e1543c79dac54888e955b12f0701d755e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x316D 24620 bytes
font_01_sfnt_off000069a1.bin
342a41804753b243bf13fa7c19db71c7debbb8fa80f4750c82899b0ccf7aa343		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A1 18880 bytes

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