Malicious PDF — malware analysis report

Static analysis result for SHA-256 f518ca5fbcd277b7…

MALICIOUS

PDF

34.2 KB Created: 2021-06-19 08:06:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 63d18cc2e6f1ea9b6b4e6991b2df2f71 SHA-1: 5a1bc6b5e678e90bfa293da83b274c3baba4d831 SHA-256: f518ca5fbcd277b74bb6cefcd62b9a91f55772ad3c2bb3a8c75fd44f4dc470f9
82 Risk Score

Malware Insights

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

The document lures the user with the promise of 'free Robux' and displays a fake CAPTCHA to trick them into clicking a malicious link. This link, http://netcdn.co/app/431946152/get-20212021202120212021202100-free-robux-game-hack, likely leads to a further download or exploit. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/get-20212021202120212021202100-free-robux-game-hack
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/get-free-robux-generator_GM431946152.pdf
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/roblox-scripters-for-free_GM431946152.pdf
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/free-bling-bling-card-coin-master_GM406889139.pdf
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/kohls-command-in-roblox-for-free-money_GM431946152.pdf
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/coin-master-free-spins-hack-link_GM406889139.pdf
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/coin-master-free-spins-link-2021-iphone_GM406889139.pdf
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/free-games-like-minecraft_GM479516143.pdf
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/free-robux-no-human-verification-2021-android_GM431946152.pdf
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/i-got-hacked-on-roblox_GM431946152.pdf
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/robuxy-com-free-robux_GM431946152.pdf
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/roblox-rape-hack_GM431946152.pdf
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/roblox-free-robux-website_GM431946152.pdf
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/coin-master-free-spins_GM406889139.pdf
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/coin-master-free-spins-link-today-hack_GM406889139.pdf
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/free-stuff-in-roblox-2021_GM431946152.pdf
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/coin-master-hack-mod-apk-free-download_GM406889139.pdf
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/coin-master-free-coins-link-blogspot_GM406889139.pdf
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/how-to-get-free-robux_GM431946152.pdf
    • http://gabrielprogramador.com.br/alfaleiloes/upload/files/coin-master-support_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000304a.bin
44dd33d53b9a502ca0766371e57195c255e8959edf06589b216aece19a352116
pdf-font-stream PDF embedded font (sfnt) at offset 0x304A 21640 bytes
font_01_sfnt_off00005fca.bin
72a1a6f9c60ee8ab31e411e7d4f0a16423654e41accf8ca5cc7b8a0b707f6df3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCA 19224 bytes