Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bf330f63b7adcd…

MALICIOUS

PDF

34.6 KB Created: 2021-07-20 11:16:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8dd6ad8dc8e12abb12075d26451dcba2 SHA-1: 3a66d26658ec0b6fdf41a8cbbfd1ed156c8030d4 SHA-256: 40bf330f63b7adcd5b128a538651a8309da3efad6187799ffe189fdf4b093509
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 downloading a malicious application disguised as a Minecraft download. The embedded URLs point to suspicious domains hosting what appear to be fake installers or further lures. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.tw/app/479516143/minecraft-pe-0.15-0-apk-free-download-game-hack
    • https://key8013805.com.tw/upload/files/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdf
    • https://key8013805.com.tw/upload/files/minecraft-pe-free_GM479516143.pdf
    • https://key8013805.com.tw/upload/files/free-robux-offers_GM431946152.pdf
    • https://key8013805.com.tw/upload/files/free-robux-working_GM431946152.pdf
    • https://key8013805.com.tw/upload/files/free-minecraft-games-for-kids_GM479516143.pdf
    • https://key8013805.com.tw/upload/files/how-to-get-free-skins-in-minecraft_GM479516143.pdf
    • https://key8013805.com.tw/upload/files/minecraft-education-free_GM479516143.pdf
    • https://key8013805.com.tw/upload/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • https://key8013805.com.tw/upload/files/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdf
    • https://key8013805.com.tw/upload/files/how-to-get-followers-on-tiktok-for-free_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fac.bin
aed2af34d202bcbc18dc2eb64a540240e93ae2c091dcad111270420da22406f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2FAC 22712 bytes
font_01_sfnt_off00006269.bin
9273c8c2b8a269721a9438858e1c0aeb95c142b4551f9d4ca11e724d76d79d6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6269 19268 bytes

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