Malicious PDF — malware analysis report

Static analysis result for SHA-256 4338520a5ab30c22…

MALICIOUS

PDF

43.4 KB Created: 2021-05-11 07:31:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 18b7e673950dc8418ba759751da90d94 SHA-1: ad5e2799a7aa093bbffff1b292910b146c8341c2 SHA-256: 4338520a5ab30c228fe46f90d72a57773c951e324074cd0dcedde1a538736fce
82 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA or human verification prompt to trick the user into clicking a link. This link, 'https://netcdn.xyz/app/431946152/how-to-get-free-robux-2021-game-hack', likely leads to the download of a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/how-to-get-free-robux-2021-game-hack
    • http://new-era.com.tw/image/data/files/ultimate-free-spins-coin-master_GM406889139.pdf
    • http://new-era.com.tw/image/data/files/minecraft-hacks-pc_GM479516143.pdf
    • https://new-era.com.tw/image/data/files/rewards-roblox_GM431946152.pdf
    • https://new-era.com.tw/image/data/files/free-spins-and-coins-blogspot-coin-master_GM406889139.pdf
    • https://new-era.com.tw/image/data/files/coin-master-free-spins-hack_GM406889139.pdf
    • http://new-era.com.tw/image/data/files/coin-master-daily-free-spins-link-haktuts_GM406889139.pdf
    • http://new-era.com.tw/image/data/files/coin-master-extra-spins_GM406889139.pdf
    • http://new-era.com.tw/image/data/files/static-moonactive-net_GM406889139.pdf
    • https://new-era.com.tw/image/data/files/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdf
    • http://new-era.com.tw/image/data/files/how-do-u-get-free-robux-2021_GM431946152.pdf
    • https://new-era.com.tw/image/data/files/roblox-earn_GM431946152.pdf
    • https://new-era.com.tw/image/data/files/hack-mod-coin-master_GM406889139.pdf
    • http://new-era.com.tw/image/data/files/grabpoints-robux_GM431946152.pdf
    • https://new-era.com.tw/image/data/files/impact-minecraft-hack_GM479516143.pdf
    • https://new-era.com.tw/image/data/files/roblox-free-body_GM431946152.pdf
    • https://new-era.com.tw/image/data/files/free-robux-app-real_GM431946152.pdf
    • https://new-era.com.tw/image/data/files/krnl-roblox_GM431946152.pdf
    • https://new-era.com.tw/image/data/files/moon-active_GM406889139.pdf
    • https://new-era.com.tw/image/data/files/minecraft-bedrock-edition-pc-download-free_GM479516143.pdf
    • http://new-era.com.tw/image/data/files/minecraft-survival-hacks_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000488c.bin
8d1a13b0e2cf8b1be0b6b3b14221ef72ce5ce9dbf86a654250e4721c32d0a116		 pdf-font-stream PDF embedded font (sfnt) at offset 0x488C 27156 bytes
font_01_sfnt_off00008603.bin
662354714a7c4aa127b8bd681013e9d5d113fbfc5a2f5afb2d34764175bb04a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8603 18684 bytes

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