PDF malware analysis — malicious · ced9965d22bdb238

MALICIOUS

PDF

49.0 KB Created: 2021-06-10 14:55:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13

MD5: d79b91d4dd5d2554b7fb3eec8da107ad SHA-1: 6cb8dcc89b6779c0081e052b8d064b881a8cb28e SHA-256: ced9965d22bdb238dca2385fcd797167098a562c463106a04802bb20f834a71e

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are structured as SEO-friendly slugs pointing to game-related content. The primary external URI, https://netcdn.tw/app/431946152/shirt-template-roblox-download-free-game-hack, suggests a lure for game cheats or downloads. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links indicates a potential link farm designed to distribute malware or lead to phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/shirt-template-roblox-download-free-game-hack PDF link annotation
- https://www.ruchya.com.tw/upload/files/coin-master-free-spin-now_GM406889139.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/coin-master-level-4_GM406889139.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/is-pokemon-go-fest-free_GM1094591345.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/roblox-hack-ios_GM431946152.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/free-shirt-templates-roblox_GM431946152.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/coin-master-hacks-no-surveys_GM406889139.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/minecraft-free-trial_GM479516143.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/free-tiktok-accounts-with-2021-fans_GM835599320.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/free-spins-on-coin-masters_GM406889139.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
`stream_004_off00005139.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5139	25596 bytes
SHA-256: `ec833004547f644471254a3748d65c22873c1fb3174a49f082ba43ef4f665769`
`font_01_sfnt_off00008c47.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8C47	5696 bytes
SHA-256: `450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139`
`font_02_sfnt_off00009959.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9959	19508 bytes
SHA-256: `9c36c9ad054a2950dbe71ccb14dbc4f9785eeab11f3a6f4194f31ea244c22c25`

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