PDF malware analysis — malicious · c3a66d0bc1fa4f8f

MALICIOUS

PDF

46.0 KB Created: 2021-05-15 13:50:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: cf8eede2f13a89059571d617ab00f6c1 SHA-1: a2c67cfc2d3bbae6d4077e70af876e036db815b6 SHA-256: c3a66d0bc1fa4f8fcee22803b3a45c45f608c185fa3aa4c9221fbc2cffd882ed

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs and a "link farm" structure, strongly suggesting it is designed to redirect users to potentially malicious websites. The document body and extracted URLs indicate a lure related to "free Robux" and "Coin Master" game cheats, a common social engineering tactic. The presence of external links and the ML classifier's high confidence score support the assessment of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 4

Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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/free-robux-generator-without-human-verification-game-hack
- https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/how-to-get-more-spins-on-coin-master_GM406889139.pdf
- https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/minecraft-multiplayer-free_GM479516143.pdf
- https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/coin-master-daily-free-spins-link-2021_GM406889139.pdf
- https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdf
- https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/rbxcity-free-robux_GM431946152.pdf
- https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/coin-master-hack-cheat-generator-d_GM406889139.pdf
- https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/coin-master-hack-without-verification-code_GM406889139.pdf
- https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/how-to-get-free-robux-on-computer_GM431946152.pdf
- https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-spins-coin-master-links-2021_GM406889139.pdf
- https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-roblox-com_GM431946152.pdf
- https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-coin-master-spins-and-coins_GM406889139.pdf
- https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-spin-coin-master-2021-link_GM406889139.pdf
- https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-robux-mod_GM431946152.pdf
- https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-roblox-clothes-2021_GM431946152.pdf
- https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/aimbot-exe-roblox_GM431946152.pdf
- https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/download-coin-master-apk-hack_GM406889139.pdf
- https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-spins-coin-master-blogspot_GM406889139.pdf
- https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/hack-coin-master-without-verification_GM406889139.pdf
- https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/spinuri-gratis-coin-master_GM406889139.pdf
- https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/get-free-robux_GM431946152.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_off00004c5d.bin` `20bf436821e59e9e5402c378bf495bf235dcd4b8dad2bc6d978c85e500756fe3`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4C5D	28720 bytes
`font_01_sfnt_off00008f2d.bin` `40a7d61fbe05f3c06cc4b4f213318e5db23b17d00e7c534d307fd6e415ac6071`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8F2D	19224 bytes

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