Malicious PDF — malware analysis report

Static analysis result for SHA-256 9445b6f5415878ea…

MALICIOUS

PDF

42.6 KB Created: 2021-06-13 19:31:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e8625fc6063c368c0ff9b950900b78c9 SHA-1: 3c61028f9df0d8798bb2bdc10166d3b6d7e84d25 SHA-256: 9445b6f5415878eaac70a9488d82ba0b47e85d4b509aea7b916bdf6f9a7f4213
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 malicious link. The embedded URL, http://netcdn.co/app/431946152/free-robux-rbx.place-game-hack, likely leads to the download of a second-stage payload. The use of a fake CAPTCHA and a lure for free in-game currency suggests a common social engineering tactic.

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 http://netcdn.co/app/431946152/free-robux-rbx.place-game-hack
    • http://cornerwebstudio.com/images/roblox-hacked-com-2021_GM431946152.pdf
    • http://cornerwebstudio.com/images/free-tiktok-likes-without-verification_GM835599320.pdf
    • http://cornerwebstudio.com/images/how-to-get-free-robux-on-ipad_GM431946152.pdf
    • http://cornerwebstudio.com/images/how-to-play-minecraft-for-free_GM479516143.pdf
    • http://cornerwebstudio.com/images/free-robux-without-any-verification_GM431946152.pdf
    • http://cornerwebstudio.com/images/coin-master-daily-free-spins-link-app_GM406889139.pdf
    • http://cornerwebstudio.com/images/minecraft-free-trial_GM479516143.pdf
    • http://cornerwebstudio.com/images/ways-to-get-free-robux-2021_GM431946152.pdf
    • http://cornerwebstudio.com/images/free-robux-websites-no-human-verification_GM431946152.pdf
    • http://cornerwebstudio.com/images/free-tik-tok-quiz_GM835599320.pdf
    • http://cornerwebstudio.com/images/how-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://cornerwebstudio.com/images/is-there-a-free-version-of-minecraft_GM479516143.pdf
    • http://cornerwebstudio.com/images/hack-coin-master-app-ios_GM406889139.pdf
    • http://cornerwebstudio.com/images/roblox-hack-scripts-pastebin_GM431946152.pdf
    • http://cornerwebstudio.com/images/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://cornerwebstudio.com/images/coin-spin-link_GM406889139.pdf
    • http://cornerwebstudio.com/images/free-minecraft-premium-account_GM479516143.pdf
    • http://cornerwebstudio.com/images/coin-master-hack-twitter_GM406889139.pdf
    • http://cornerwebstudio.com/images/minecraft-pe-hacks_GM479516143.pdf
    • http://cornerwebstudio.com/images/fre-robux-fro-reallllllll_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048e5.bin
cf10f706cba69d9b44fccc81e9a69d7c272c369cf80cbbe3a6cd6ce034e79496		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48E5 25596 bytes
font_01_sfnt_off0000834f.bin
ddd3be376f5b82e5107f2b1577681eea8cf9987f4669b72a842934473beb8f33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x834F 18556 bytes

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