PDF malware analysis — malicious · 870f84e449e36b5a

MALICIOUS

PDF

35.5 KB Created: 2021-07-03 15:53:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: 31f89ef7e3a6025cedf4d50cbb4d5f2c SHA-1: 32552496a08be53ce01204a07ccfff2bfcb8ae5a SHA-256: 870f84e449e36b5a79928c7da19338bf3d261f003c6cb6bef74b9146919645e4

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links, including a primary malicious URL pointing to a game hack site. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many with descriptive slugs, suggesting an attempt to generate traffic or distribute further malicious content. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest a phishing or scam attempt.

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 http://netcdn.tw/app/406889139/coin-master-free-gift-link-2021-game-hack
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/wurst-18_GM479516143.pdf
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/how-you-get-free-robux_GM431946152.pdf
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/free-robux-without-offers_GM431946152.pdf
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/descargar-roblox-para-android-hack_GM431946152.pdf
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/can-you-get-free-pokeballs-in-pokemon-go_GM1094591345.pdf
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/free-spin-in-coin-master_GM406889139.pdf
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/free-robux-gift-card-codes_GM431946152.pdf
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/robux-websites-that-work_GM431946152.pdf
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/free-spins-coin-master-without-survey_GM406889139.pdf
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/minecraft-windows-10-free-with-java_GM479516143.pdf
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/free-robux-no-verification-at-all_GM431946152.pdf
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/hack-coin-master-ios-download_GM406889139.pdf
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/how-to-get-free-robux-no-scam-works-2021-nitroxium_GM431946152.pdf
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/roblox-gift-card-online-free_GM431946152.pdf
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/instantrobux_GM431946152.pdf
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/roblox-free-play-no-download_GM431946152.pdf
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/hack-the-game-coin-master_GM406889139.pdf
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/minecraft-hack-2021_GM479516143.pdf
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox_GM431946152.pdf
- https://kultura.orb.ru/uploads/ckfinder/userfiles/files/roblox-install-free-mac_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_002_off0000338b.bin` `cb3d9bd39ad6fc7a3c9ba7c4efd8d0b4c8018fba97f6375ad3ff9f6a1a443ef3`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x338B	22904 bytes
`font_01_sfnt_off00006713.bin` `dca762f67b78dd01cbc18695cdf6cd64c215508eb2894a51983e815140750253`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6713	18568 bytes

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