PDF malware analysis — malicious · 4647fde9be2b19d7

MALICIOUS

PDF

49.7 KB Created: 2021-05-14 10:01:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: f552611acd110020abe4ce1b25a7a2fb SHA-1: a1ff891f1e8425c089dcae59458104c9caf1cdec SHA-256: 4647fde9be2b19d716a48ede8ea7bb126b3ab643ccdb22ff8b01b70dbae14426

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are SEO-optimized and point to websites offering "free Robux" or "free spins," indicative of a scam or phishing attempt. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a lure to external malicious content, likely a phishing or scamming operation.

Machine Learning

Nyx PDF Classifier malicious score 0.9349

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-no-human-verification-or-survey-2021-game-hack
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/coin-master-free-daily-spins-and-coins_GM406889139.pdf
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/free-headless-head-roblox_GM431946152.pdf
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdf
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/coin-master-hack-ios-without-verification_GM406889139.pdf
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/free-robux-mobile_GM431946152.pdf
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/how-to-downgrade-minecraft-pe_GM479516143.pdf
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/free-coins-and-spins_GM406889139.pdf
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/how-to-get-free-roblox-money_GM431946152.pdf
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/minecraft-bedrock-edition-pc-download-free_GM479516143.pdf
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/coin-master-free-spin-and-coin_GM406889139.pdf
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/install-free-game-coin-master_GM406889139.pdf
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/how-to-get-robux-on-roblox_GM431946152.pdf
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdf
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/mc-hacks_GM479516143.pdf
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/hey-google-how-do-you-get-free-robux_GM431946152.pdf
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/but-link-says-free-robux_GM431946152.pdf
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/coin-master-hack-app-android-download_GM406889139.pdf
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/roblox-skins-boy-free_GM431946152.pdf
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/free-robux-without-human-verification_GM431946152.pdf
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/free-roblox-gift-card_GM431946152.pdf
- http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off00004e0b.bin` `933251b54d303a9d20c4e498d1459842f9d12358b642c1ee7821586fd972539d`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4E0B	28128 bytes
`font_01_sfnt_off00008f13.bin` `450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8F13	5696 bytes
`font_02_sfnt_off00009c25.bin` `3a60cdb248c638d1e974f8488a9d0c49865e0dbecbd8cc682acbe36144e2e86e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9C25	19556 bytes

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