PDF malware analysis — malicious · e91df764f900844a

MALICIOUS

PDF

35.4 KB Created: 2021-06-27 18:41:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18

MD5: 627c19c1cd69eb716f2d92fb19ac3ac8 SHA-1: ab1b69669ebb042e43b23c4a5710551c8f0feb93 SHA-256: e91df764f900844a40b4a9a7aaea6a9ebcbb345455923c371fdbe7eb2776e54f

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 4

PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE

PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
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 http://netcdn.co/app/431946152/claimrbx-free-robux-game-hack PDF link annotation
- https://thoisuviet.vn/public/ckfinder/userfiles/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/roblox-op-free-gui_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/free-flip-master-coins_GM406889139.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/free-roblox-gift-card-codes-codes_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/roblox-how-to-get-free-robux-on-ipad-2021_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/irobux-com-redeem_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/coin-master-hack-tool-apk-download_GM406889139.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/descargar-roblox-hackeado-para-android_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/roblox-tracker_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/www-free-robux-com_GM431946152.pdfIn PDF document text
- https://www.roblox.com/my/tasksIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000032aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x32AA	22572 bytes
SHA-256: `2fcb8cab5456179dbf0c62f480f308c6e3ed01fa750a88ebdd7f4f47fc8e2366`
`font_01_sfnt_off0000650f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x650F	19168 bytes
SHA-256: `7bf764ce28968fdb785bb336023e4079e63a9f6de2364164f85b44d41da13fd4`

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