PDF malware analysis — malicious · c91ae7cf71a9054c

MALICIOUS

PDF

43.3 KB Created: 2021-05-11 01:06:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: 9a96b7ba5a4024bc46078991da777de3 SHA-1: 8d029c73e4eadd6536bed9eed82683a85840b5c6 SHA-256: c91ae7cf71a9054c772e698cc1f3cd7d613df70ec10a6c11c7631bfc9fa9b64f

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, designed to trick users into interacting with the document. It also contains an embedded URI pointing to a suspicious URL, likely intended to download a second-stage payload. The ML classifier strongly flagged this PDF as malicious, supporting the observed attack pattern.

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/rbx-free-robux-game-hack
- http://www.otomasi.uinjambi.ac.id/repository/roblox-dominus-free_GM431946152.pdf
- http://www.otomasi.uinjambi.ac.id/repository/free-roblox-pin-codes_GM431946152.pdf
- http://www.otomasi.uinjambi.ac.id/repository/coin-master-hack-without-verification-site-zyngaplayerforumscom_GM406889139.pdf
- http://www.otomasi.uinjambi.ac.id/repository/coin-master-daily-free-spin-app_GM406889139.pdf
- http://www.otomasi.uinjambi.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdf
- http://www.otomasi.uinjambi.ac.id/repository/www-bandicam-com-free-robux_GM431946152.pdf
- http://www.otomasi.uinjambi.ac.id/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdf
- http://www.otomasi.uinjambi.ac.id/repository/robux-website_GM431946152.pdf
- http://www.otomasi.uinjambi.ac.id/repository/free-robux-2021_GM431946152.pdf
- http://www.otomasi.uinjambi.ac.id/repository/roblox-hack-client_GM431946152.pdf
- http://www.otomasi.uinjambi.ac.id/repository/blogger-coin-master-free-spins_GM406889139.pdf
- http://www.otomasi.uinjambi.ac.id/repository/free-coin-spin-daily-link-net_GM406889139.pdf
- http://www.otomasi.uinjambi.ac.id/repository/how-to-hack-roblox-2021_GM431946152.pdf
- http://www.otomasi.uinjambi.ac.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdf
- http://www.otomasi.uinjambi.ac.id/repository/how-to-get-free-robux-promo-codes_GM431946152.pdf
- http://www.otomasi.uinjambi.ac.id/repository/coin-master-facebook-page_GM406889139.pdf
- http://www.otomasi.uinjambi.ac.id/repository/roblox-hack_GM431946152.pdf
- http://www.otomasi.uinjambi.ac.id/repository/coin-master-cheats-free_GM406889139.pdf
- http://www.otomasi.uinjambi.ac.id/repository/hack-coin-master-spin_GM406889139.pdf
- http://www.otomasi.uinjambi.ac.id/repository/free-spins-coin-master-blogspot_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_003_off00004bbf.bin` `539756c589c1ac940832f7f7e60c5da7c665526489c9dcdc66823219ff7ba164`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4BBF	26472 bytes
`font_01_sfnt_off000087cb.bin` `03f7603bc8a5695bbd0c39958af3fcfd5a932cbc13eba7563a8e8ca8b5ca4208`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x87CB	18012 bytes

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