Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea1632e12372bc1…

MALICIOUS

PDF

37.8 KB Created: 2021-05-20 15:12:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7d9f036b2b97a6a7733259c3376dcbfe SHA-1: 09b8915d94f747cf4747d7c15d265f68dff8fd83 SHA-256: cea1632e12372bc12a15c703d50f739dc6ae46a8e7009da5bfcf9db46b74899a
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and download button to trick the user into clicking a malicious link. The ML classifier also flagged this PDF as malicious. The embedded URLs likely lead to further malicious content or malware downloads, such as the Roblox generator link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/roblox-games-free-game-hack
    • https://tnupacktour.com.tw/image/data/files/how-to-hack-coin-master_GM406889139.pdf
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-link-blogspot_GM406889139.pdf
    • https://tnupacktour.com.tw/image/data/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • https://tnupacktour.com.tw/image/data/files/tiktok-free-advertising_GM835599320.pdf
    • https://tnupacktour.com.tw/image/data/files/hack-coin-master-for-android_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003517.bin
a028f33875d9c53cbb56a05cb5f2c6385d9c720290b402ebeed0e6a9c76963c6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3517 26616 bytes
font_01_sfnt_off00007210.bin
c854a6c24cd9397543535c319deb2c67afb6e9d7a93f095be0a0206a19e96549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7210 18436 bytes

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