PDF malware analysis — malicious · 3adb78739d88eeb0

MALICIOUS

PDF

34.0 KB Created: 2021-07-05 07:06:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: 79ecfdf1f32805e6304523788f28603a SHA-1: 310b2ccd1805dc9243aef18b64794b48910cea54 SHA-256: 3adb78739d88eeb0ee2e5c84a9b225c6f242ea1d8cf05529992981ee7305a9cc

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that explicitly advertises free game hacks and currency for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users. The primary URL, http://netcdn.tw/app/431946152/redeem-roblox-card-free-game-hack, is likely the download location for a malicious payload. Although no scripts were explicitly extracted, the nature of the content and the ML classification strongly suggest 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 http://netcdn.tw/app/431946152/redeem-roblox-card-free-game-hack
- https://www.tvoyo.tv/ckfinder/userfiles/files/roblox-hack-download-mac_GM431946152.pdf
- https://www.tvoyo.tv/ckfinder/userfiles/files/best-site-for-free-coin-master_GM406889139.pdf
- https://www.tvoyo.tv/ckfinder/userfiles/files/free-account-roblox-with-robux_GM431946152.pdf
- https://www.tvoyo.tv/ckfinder/userfiles/files/black-clover-online-hack-roblox_GM431946152.pdf
- https://www.tvoyo.tv/ckfinder/userfiles/files/coin-master-free-spins-link-download-hack_GM406889139.pdf
- https://www.tvoyo.tv/ckfinder/userfiles/files/how-to-setup-a-minecraft-server-for-free_GM479516143.pdf
- https://www.tvoyo.tv/ckfinder/userfiles/files/free-robux-accounts_GM431946152.pdf
- https://www.tvoyo.tv/ckfinder/userfiles/files/how-to-get-free-hair-in-roblox_GM431946152.pdf
- https://www.tvoyo.tv/ckfinder/userfiles/files/earn-points-for-free-robux_GM431946152.pdf
- https://www.tvoyo.tv/ckfinder/userfiles/files/how-to-get-free-penguin-in-roblox_GM431946152.pdf
- https://www.tvoyo.tv/ckfinder/userfiles/files/games-to-get-free-robux_GM431946152.pdf
- https://www.tvoyo.tv/ckfinder/userfiles/files/how-to-get-free-robux-no-joke-2021_GM431946152.pdf
- https://www.tvoyo.tv/ckfinder/userfiles/files/free-spins-for-coin-master-game_GM406889139.pdf
- https://www.tvoyo.tv/ckfinder/userfiles/files/free-robux-now_GM431946152.pdf
- https://www.tvoyo.tv/ckfinder/userfiles/files/500-free-spins-coin-master_GM406889139.pdf
- https://www.tvoyo.tv/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-in-2021_GM431946152.pdf
- https://www.tvoyo.tv/ckfinder/userfiles/files/daily-coin-master-link_GM406889139.pdf
- https://www.tvoyo.tv/ckfinder/userfiles/files/roblox-magitan-hack-2021_GM431946152.pdf
- https://www.tvoyo.tv/ckfinder/userfiles/files/best-free-minecraft-hacked-client_GM479516143.pdf
- https://www.tvoyo.tv/ckfinder/userfiles/files/go-to-robuxhackpro_GM431946152.pdf
- http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000030e9.bin` `651639f1ceb456b27a345d1430d9cc88b48cefbd761fb7b4e5c75bea2bc3a001`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x30E9	21396 bytes
`font_01_sfnt_off00005fac.bin` `28b83e4f342e4f09a2889314eefb4cea0c2396b4c6f42210c3755af6e96d1200`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5FAC	19084 bytes

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