PDF malware analysis — malicious · 4de13f9493248567

MALICIOUS

PDF

49.3 KB Created: 2021-06-08 16:16:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: cefb3c71997879560981111a6b9eeca5 SHA-1: 29cd39dae67cc06a5fe2fed7794a9ea2887cf76c SHA-256: 4de13f949324856749b2197582ce29e6c212dfdfd93558ee47d5f66369b4e06e

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 0.9796

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 https://netcdn.tw/app/431946152/free-robux-promo-codes-may-2021-game-hack PDF link annotation
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/websites-for-robux_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/robux-hack-generator_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/robux_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/free-2021-robux_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/roblox-speed-hack-2021-august_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/roblox-hacked-accounts-list_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/tiktok-free-6-months_GM835599320.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/roblox-rewards-robux_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/pokemon-go-free-account-username-and-password_GM1094591345.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/roblox-login-hack_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/free-roblox-money_GM431946152.pdfIn PDF document text
- https://gzhi.govvrn.ru/uploads/ckfinder/userfiles/files/roblox-hack-game_GM431946152.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000051a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x51A9	26548 bytes
SHA-256: `2da2278abd26eaddc6663c3841665bb4b6913bbf5d6035a01ae3ed27c73cbce6`
`font_01_sfnt_off00008d96.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8D96	5596 bytes
SHA-256: `9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5`
`font_02_sfnt_off00009a3d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9A3D	19608 bytes
SHA-256: `df6f5157b2e886c6ba57e14707670064151e2d68518dfb0d0ea00f057bbc5a60`

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