Malicious PDF — malware analysis report

Static analysis result for SHA-256 674f83830ee4400a…

MALICIOUS

PDF

44.9 KB Created: 2021-05-16 05:14:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5b4eab0fcebcfdba8570a63e36da4bb1 SHA-1: 7e85c1bc46227c03b3dcb58809f1ac7c3e1d53c7 SHA-256: 674f83830ee4400a49cfeb8d719593863df05dde5e15ea5e307ce0dd3a88c4a9
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking malicious links. The embedded URLs, such as 'https://netcdn.xyz/app/431946152/robux-scam-game-hack', likely lead to scam websites or malware downloads. The ML classifier also flagged this PDF as malicious with high confidence.

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/robux-scam-game-hack
    • https://www.nonglong.go.th/ddd/UserFiles/File/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • https://www.nonglong.go.th/ddd/UserFiles/File/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • https://www.nonglong.go.th/ddd/UserFiles/File/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • https://www.nonglong.go.th/ddd/UserFiles/File/coin-master-hack-https-coinms-net_GM406889139.pdf
    • https://www.nonglong.go.th/ddd/UserFiles/File/how-to-get-minecraft-java-for-free_GM479516143.pdf
    • https://www.nonglong.go.th/ddd/UserFiles/File/hack-coin-master-app_GM406889139.pdf
    • https://www.nonglong.go.th/ddd/UserFiles/File/coin-master-hack-tool-2021_GM406889139.pdf
    • https://www.nonglong.go.th/ddd/UserFiles/File/free-robux-giveaway_GM431946152.pdf
    • https://www.nonglong.go.th/ddd/UserFiles/File/free-coin-master-spins-link_GM406889139.pdf
    • https://www.nonglong.go.th/ddd/UserFiles/File/get-free-spins-on-coin-master-2021_GM406889139.pdf
    • https://www.nonglong.go.th/ddd/UserFiles/File/free-coin-coin-master_GM406889139.pdf
    • https://www.nonglong.go.th/ddd/UserFiles/File/oprewards-free-robux_GM431946152.pdf
    • https://www.nonglong.go.th/ddd/UserFiles/File/free-spin-link-of-coin-master_GM406889139.pdf
    • https://www.nonglong.go.th/ddd/UserFiles/File/websites-to-get-free-robux_GM431946152.pdf
    • https://www.nonglong.go.th/ddd/UserFiles/File/all-coin-master-spin-link-and-free-download_GM406889139.pdf
    • https://www.nonglong.go.th/ddd/UserFiles/File/coin-master-free-spins-link-today-2021_GM406889139.pdf
    • https://www.nonglong.go.th/ddd/UserFiles/File/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdf
    • https://www.nonglong.go.th/ddd/UserFiles/File/free-spin-and-coin_GM406889139.pdf
    • https://www.nonglong.go.th/ddd/UserFiles/File/100-free-spins-for-coin-master-2021_GM406889139.pdf
    • https://www.nonglong.go.th/ddd/UserFiles/File/daily-free-spins-and-coins-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004917.bin
2dd4ed4eb71195c48b3edea8e8e2cd52f779e3740c723e1696351ebdbc78d149		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4917 24760 bytes
font_01_sfnt_off00008259.bin
e8dca988325d5b5adea380508eed68725fcb814536e93cd420f224b7166adc23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8259 2944 bytes
font_02_sfnt_off00008c84.bin
383b1d6f347944e20328288fe5cf1d6e6525012059e3a3c68a0557f2d1f0cd2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C84 18340 bytes

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