PDF malware analysis — malicious · 8512504bb1782c30

MALICIOUS

PDF

45.2 KB Created: 2021-06-03 21:03:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: eb8eb1e089f98fc0dbfabf4ca656b5af SHA-1: e99e45ac48a1d522a0e98801f15f7d0280c24689 SHA-256: 8512504bb1782c309f6f0678c400819cbdb7ed4e6b906e91992e4d2c90750775

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 and a call-to-action button, directing users to download potentially malicious content from external URLs. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the nature of the lure suggest an attempt to trick users into executing a second-stage payload, likely via a drive-by download or a malicious attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9864

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/roblox-gift-card-free-codes-game-hack
- https://kojak-group.com/userfiles/files/minecraft-ps4-free_GM479516143.pdf
- https://kojak-group.com/userfiles/files/roblox-robux-generator-2021_GM431946152.pdf
- https://kojak-group.com/userfiles/files/free-coins-coin-master-today_GM406889139.pdf
- https://kojak-group.com/userfiles/files/how-to-get-free-robux-on-computer_GM431946152.pdf
- https://kojak-group.com/userfiles/files/free-roblox-svg_GM431946152.pdf
- https://kojak-group.com/userfiles/files/coin-master-club-hack_GM406889139.pdf
- https://kojak-group.com/userfiles/files/tiktok-for-free_GM835599320.pdf
- https://kojak-group.com/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdf
- https://kojak-group.com/userfiles/files/coin-master-hack-tool-without-verification_GM406889139.pdf
- https://kojak-group.com/userfiles/files/free-minecraft-server-maker_GM479516143.pdf
- https://kojak-group.com/userfiles/files/coin-master-hack-app_GM406889139.pdf
- https://kojak-group.com/userfiles/files/coin-master-hack-spins_GM406889139.pdf
- https://kojak-group.com/userfiles/files/ac-market-coin-master-hack_GM406889139.pdf
- https://kojak-group.com/userfiles/files/hack-to-protect-village-on-coin-master_GM406889139.pdf
- https://kojak-group.com/userfiles/files/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdf
- https://kojak-group.com/userfiles/files/coin-master-hack-2021_GM406889139.pdf
- https://kojak-group.com/userfiles/files/how-to-buy-robux-for-free_GM431946152.pdf
- https://kojak-group.com/userfiles/files/how-can-i-get-free-robux_GM431946152.pdf
- https://kojak-group.com/userfiles/files/free-robux-picture_GM431946152.pdf
- https://kojak-group.com/userfiles/files/coin-master-rewards-free-spins_GM406889139.pdf
- http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off000051b0.bin` `460ba360fbff580cb5eb715b39331a7e2ed48d61d7b6331f2619e9b67f254bc6`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x51B0	25996 bytes
`font_01_sfnt_off00008d4e.bin` `9c63177eafc3ac88b713a1cd2104529c3a7676e5ce127b5a80c9c06234e3cf10`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8D4E	18572 bytes

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