Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba8c03674acd158…

MALICIOUS

PDF

44.9 KB Created: 2021-05-19 06:31:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4f464516ea1c61ebd7e7edb9653707e2 SHA-1: b8afc62f1a8c31e35551b8905f7bb84fae10cf4d SHA-256: dba8c03674acd15832b1c3fd35fcfec533ea010c00f6bfa964b3f6b86f512f92
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick users into interacting with it, likely to initiate a download. The embedded URL `https://netcdn.xyz/app/431946152/codes-to-get-free-robux-game-hack` and numerous other URLs point to potential download locations for malicious payloads. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to exploit user interaction for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/codes-to-get-free-robux-game-hack
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/coin-master-unlimited-spin-apk-free-download_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/coin-master-facebook_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/coin-master-cheats-2021_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/get-more-robux_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/roblox-cheat-codes_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/free-robux-no-verify_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/coin-master-spin-blogspot_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/coinmasterdailyfreespins-com_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/daily-free-spins-on-coin-master_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/master-8-ball-pool-free-coins_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/coin-master-fan-page-free-spins_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/mobihack-net-roblox-hack_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/how-to-get-free-robux-on-phone_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/free-2021-robux_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/free-spins-for-coin-master_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/coin-master-update-2021_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/minecraft-survival-free_GM479516143.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/roblox-hack-me_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/how-do-i-earn-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004bae.bin
63b7fe437f09e6c1ddfdbcb9ce8b21364b9542d118ae2572f44676f33f4962a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BAE 24972 bytes
font_01_sfnt_off00008327.bin
fd98c8f6e7c2e74bbd5822409159a93ac5c94da083ae4c2eb269d4284375f9e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8327 2836 bytes
font_02_sfnt_off00008ccd.bin
c4e16f213ba515826b0fc8bd2adb9a42249615e2a7fe5232f5ebe2d4ec6172c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CCD 18292 bytes

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