Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b59e9105550051f…

MALICIOUS

PDF

44.2 KB Created: 2021-05-16 11:01:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 05e3cb770bac972d2185b0e5a5ec2e53 SHA-1: 231e1be8a8c28142ad244a5daa1612f8caae4936 SHA-256: 3b59e9105550051f57985399b690a89fdd194a6ab5f488668dd5976b6ec22dcf
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 to trick the user into clicking a link. The embedded URLs, such as 'https://netcdn.xyz/app/431946152/how-to-get-free-robux-easy-on-phone-game-hack', likely lead to the download of a second-stage payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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-easy-on-phone-game-hack
    • http://fishboat.hr/files/minecraft-pe-hack-client-2021_GM479516143.pdf
    • https://www.fishboat.hr/files/minecraft-wurst-hacked-client_GM479516143.pdf
    • https://www.fishboat.hr/files/coin-master-free-coins_GM406889139.pdf
    • http://fishboat.hr/files/minecraft-svg-images-free_GM479516143.pdf
    • https://www.fishboat.hr/files/free-robux-no-downloading-apps_GM431946152.pdf
    • http://fishboat.hr/files/free-robux-hacks-no-verification_GM431946152.pdf
    • http://fishboat.hr/files/coin-master-34-6-hack_GM406889139.pdf
    • http://fishboat.hr/files/free-spins-coin-master-hack-2021_GM406889139.pdf
    • https://www.fishboat.hr/files/coin-master-free-spin-today-2021_GM406889139.pdf
    • https://www.fishboat.hr/files/free-robux-2021-no-human-verification_GM431946152.pdf
    • https://www.fishboat.hr/files/coin-master-bonus_GM406889139.pdf
    • https://www.fishboat.hr/files/free-links-coin-master_GM406889139.pdf
    • http://fishboat.hr/files/how-to-get-roebucks-on-roblox_GM431946152.pdf
    • http://fishboat.hr/files/coin-master-spins-hack-2021_GM406889139.pdf
    • http://fishboat.hr/files/cm-free-spins_GM406889139.pdf
    • http://fishboat.hr/files/get-robux-com_GM431946152.pdf
    • https://www.fishboat.hr/files/free-spins-coin-master-links_GM406889139.pdf
    • http://fishboat.hr/files/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • http://fishboat.hr/files/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdf
    • http://fishboat.hr/files/minecraft-for-free-on-phone_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ce8.bin
25d5ece41492bacbccc116e0882d00c9164fc5952d9fe0cdca7cfeb69de440d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CE8 25472 bytes
font_01_sfnt_off00008835.bin
e6e3347b6ae704c87521381cf50d1046861d1e5efe3155f159bfcc6a29e599dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8835 19008 bytes

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