Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de77c1716581e4a…

MALICIOUS

PDF

51.6 KB Created: 2021-06-03 11:55:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c25904fa7c6f683a41839f6029883100 SHA-1: 5275642a8ab548c1170c79d55d529411a3856f9e SHA-256: 9de77c1716581e4a515fe2542ea5c18655651f9c2a053a29cc4239a66fe51268
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document displays a fake CAPTCHA or human verification prompt, a common social engineering tactic to trick users into interacting with malicious content. It also contains an embedded URI pointing to a URL that appears to be related to obtaining free Robux, a common lure for gaming-related scams. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9464

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.online/app/431946152/how-to-get-free-robux-for-free-game-hack
    • https://lib.insan-unggul.ac.id/repository/minecraft-windows-10-edition-free_GM479516143.pdf
    • https://lib.insan-unggul.ac.id/repository/how-to-get-free-robux-on-pc_GM431946152.pdf
    • https://lib.insan-unggul.ac.id/repository/claim-free-robux_GM431946152.pdf
    • https://lib.insan-unggul.ac.id/repository/coin-master-free-spins-link-today-2021_GM406889139.pdf
    • https://lib.insan-unggul.ac.id/repository/roblox-zone-free-robux_GM431946152.pdf
    • https://lib.insan-unggul.ac.id/repository/coin-master-34-4-free-download_GM406889139.pdf
    • https://lib.insan-unggul.ac.id/repository/pubg-uc-200_GM1330123889.pdf
    • https://lib.insan-unggul.ac.id/repository/free-robux-no-verification-no-download-2021_GM431946152.pdf
    • https://lib.insan-unggul.ac.id/repository/free-robux-card-codes_GM431946152.pdf
    • https://lib.insan-unggul.ac.id/repository/pubg-2021-uc_GM1330123889.pdf
    • https://lib.insan-unggul.ac.id/repository/pubg-uc-low-price_GM1330123889.pdf
    • https://lib.insan-unggul.ac.id/repository/free-robux-codes-2021-real_GM431946152.pdf
    • https://lib.insan-unggul.ac.id/repository/how-can-you-get-free-robux_GM431946152.pdf
    • https://lib.insan-unggul.ac.id/repository/how-to-get-free-spins-on-coin-master-2021-links_GM406889139.pdf
    • https://lib.insan-unggul.ac.id/repository/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdf
    • https://lib.insan-unggul.ac.id/repository/free-coin-master-coins_GM406889139.pdf
    • https://lib.insan-unggul.ac.id/repository/coin-master-free-gold-cards-link-2021_GM406889139.pdf
    • https://lib.insan-unggul.ac.id/repository/pubg-uc-price-in-uae_GM1330123889.pdf
    • https://lib.insan-unggul.ac.id/repository/roblox-com-free-robux_GM431946152.pdf
    • https://lib.insan-unggul.ac.id/repository/play-minecraft-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000573e.bin
b2836b867770bd59879fc3c357554f4f277e34501ad74015088588bc99471b7e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x573E 30772 bytes
font_01_sfnt_off00009da0.bin
1d0cb1023eaa225682b8e7a2c8df4e4c96545ba7eedaf3d9844e51183e9ca189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DA0 2824 bytes
font_02_sfnt_off0000a74d.bin
2eeeedfcb2f224ab556fa0ab031baeab03f86dcbcf90e3baaaf5b6d88536dec3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA74D 18280 bytes

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