Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7be7aa18d010ec…

MALICIOUS

PDF

48.5 KB Created: 2021-06-03 08:45:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5ecd8ba38bef1ac9b8e52a6d59e6b3e0 SHA-1: e06473a0ab8337850bed764cca5837585d214dcf SHA-256: cd7be7aa18d010ec0f8dc089d51ba0642b3215a7e2051debce2a38ade059e5d6
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, a common social engineering tactic to trick users into interacting with malicious content. It also embeds external URIs pointing to potentially malicious domains, such as 'https://netcdn.online/app/431946152/free-robux-watch-ads-game-hack', which likely serve as download locations for further stages of the attack. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/431946152/free-robux-watch-ads-game-hack
    • http://new-era.com.tw/image/data/files/www-robux-redeem_GM431946152.pdf
    • https://new-era.com.tw/image/data/files/free-robux-games-on-roblox_GM431946152.pdf
    • http://new-era.com.tw/image/data/files/give-me-free-robux_GM431946152.pdf
    • http://new-era.com.tw/image/data/files/google-how-do-you-get-free-robux_GM431946152.pdf
    • http://new-era.com.tw/image/data/files/coin-master-free-coins-app_GM406889139.pdf
    • https://new-era.com.tw/image/data/files/can-u-get-free-robux_GM431946152.pdf
    • https://new-era.com.tw/image/data/files/moon-static-coin-master-generator-hacks-free_GM406889139.pdf
    • https://new-era.com.tw/image/data/files/watch-videos-for-robux_GM431946152.pdf
    • https://new-era.com.tw/image/data/files/free-roblox-accessories_GM431946152.pdf
    • https://new-era.com.tw/image/data/files/game-toolbox_GM479516143.pdf
    • https://new-era.com.tw/image/data/files/how-to-hack-coin-master-2021_GM406889139.pdf
    • http://new-era.com.tw/image/data/files/coin-master-hack-ios-download_GM406889139.pdf
    • http://new-era.com.tw/image/data/files/minecraft-auto-miner-hack_GM479516143.pdf
    • http://new-era.com.tw/image/data/files/no-human-verification-hack-for-coin-master_GM406889139.pdf
    • http://new-era.com.tw/image/data/files/pokemon-go-free-2021_GM1094591345.pdf
    • http://new-era.com.tw/image/data/files/how-to-get-free-robux-generator_GM431946152.pdf
    • https://new-era.com.tw/image/data/files/is-tiktok-free_GM835599320.pdf
    • http://new-era.com.tw/image/data/files/how-to-change-roblox-username-for-free-2021_GM431946152.pdf
    • http://new-era.com.tw/image/data/files/daily-free-spins-on-coin-master_GM406889139.pdf
    • http://new-era.com.tw/image/data/files/free-robux-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005170.bin
6a4240cb3ca3f2fad113133b0d2dffb569c4db936034cffa927d116ab69696be		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5170 25620 bytes
font_01_sfnt_off00008c4e.bin
9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C4E 5596 bytes
font_02_sfnt_off000098f6.bin
7770496fed505e82e811ddbe3972e92c9a9cb4cd02d7470366786df73d0b94bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98F6 18884 bytes

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