Malicious PDF — malware analysis report

Static analysis result for SHA-256 4592e607255c9d33…

MALICIOUS

PDF

41.4 KB Created: 2021-05-18 01:29:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f677597bc155e137682ad93242921dfc SHA-1: 3413fcd8f7f0254e8bf47f41f407e944e2e06911 SHA-256: 4592e607255c9d33fae28df5fa560ba30560635948876cd218461d4908cf77f3
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document displays a fake CAPTCHA to lure the user into downloading a payload from the provided URL. The ML classifier strongly indicated maliciousness, and the presence of multiple download-related URLs reinforces this assessment. No scripts were extracted, limiting further analysis of the payload's behavior.

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/406889139/online-coin-master-hack-here-game-hack
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-girl_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-hack-no-verification-ios_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/40-free-spins-coin-master_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-hack-generator_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/coinmaster-rewards_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-with-no-verification-2021_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/minecraft-xbox-360-free-download-code_GM479516143.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-free-spins-promo-code_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-get-free-robux-hack_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/static-moonactive-net-rewards-2021_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/spin-free-coin-master_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-minecraft-hacks_GM479516143.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-hack-2021_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/minecraft-free_GM479516143.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/bloxpink-free-robux_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-no-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048ef.bin
f7e093287d39fb9772051460e3283f4a59f824d01a86ea827ef2a4689dfe0f37		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48EF 24544 bytes
font_01_sfnt_off000080bd.bin
d889680f8fc551e7ec9bfaa07df1fa67f8392890936cf776d8bfe8a659ce498a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80BD 17788 bytes

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