Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f1278c2610c750…

MALICIOUS

PDF

42.3 KB Created: 2021-05-19 16:41:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ca1feac2676efb9ede0eda77c7d8a0ec SHA-1: 7206c976f4fec351f7f23200c5877163188bc030 SHA-256: 11f1278c2610c75099407b9145b85682d47679f1e427c628b97c42ef8e2088ec
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking malicious links. The primary embedded URL, https://netcdn.xyz/app/431946152/robux-scam-game-hack, strongly suggests a scam or phishing attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/robux-scam-game-hack
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-hack-2021-no-human-verification_GM406889139.pdf
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-free-coins_GM406889139.pdf
    • https://cursocejas.com.br/imagens/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdf
    • https://cursocejas.com.br/imagens/userfiles/files/how-to-hack-people-in-roblox_GM431946152.pdf
    • https://cursocejas.com.br/imagens/userfiles/files/can-i-have-robux_GM431946152.pdf
    • https://cursocejas.com.br/imagens/userfiles/files/free-spins-link-in-coin-master-2021_GM406889139.pdf
    • https://cursocejas.com.br/imagens/userfiles/files/free-minecraft-shaders_GM479516143.pdf
    • https://cursocejas.com.br/imagens/userfiles/files/www-roblox-com-robux-free_GM431946152.pdf
    • https://cursocejas.com.br/imagens/userfiles/files/2021-free-coin-master-spins_GM406889139.pdf
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-free-spins-link-iphone_GM406889139.pdf
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-free-spins-hack-link_GM406889139.pdf
    • https://cursocejas.com.br/imagens/userfiles/files/how-to-free-robux_GM431946152.pdf
    • https://cursocejas.com.br/imagens/userfiles/files/free-coin-master-game_GM406889139.pdf
    • https://cursocejas.com.br/imagens/userfiles/files/links-for-coin-master-free-spins_GM406889139.pdf
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-heaven-free-spins-link-2021_GM406889139.pdf
    • https://cursocejas.com.br/imagens/userfiles/files/free-card-link-coin-master_GM406889139.pdf
    • https://cursocejas.com.br/imagens/userfiles/files/minecraft-java-server-hosting-free_GM479516143.pdf
    • https://cursocejas.com.br/imagens/userfiles/files/free-pet-snacks-coin-master_GM406889139.pdf
    • https://cursocejas.com.br/imagens/userfiles/files/how-to-get-free-roblox-premium_GM431946152.pdf
    • https://cursocejas.com.br/imagens/userfiles/files/show-me-how-to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004727.bin
62356ca76c9bac18bccf3f57b605ce023d01865c9e470445fee4b87962daca56
pdf-font-stream PDF embedded font (sfnt) at offset 0x4727 25804 bytes
font_01_sfnt_off000082be.bin
383b1d6f347944e20328288fe5cf1d6e6525012059e3a3c68a0557f2d1f0cd2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x82BE 18340 bytes