PDF malware analysis — malicious · f41bfecebcb31704

MALICIOUS

PDF

50.0 KB Created: 2021-06-07 19:31:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: df230f1efd21fa292a0acbfeb33c214d SHA-1: 20ffc7cf9d6d36df0ad97a594c8f61bd49917703 SHA-256: f41bfecebcb317044171990819c3da2b9b9ac561a077461cb6f49b24faa4005a

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to other PDF files hosted on zephyrtoys.com, suggesting a link farm designed to attract users searching for game hacks and free in-game currency. The presence of a direct link to a 'roblox-installer-for-android-free-game-hack' further supports the lure of downloading potentially unwanted or malicious software. The ML classifier also flagged this PDF as malicious with high confidence.

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/roblox-installer-for-android-free-game-hack
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-robux-no-verification-needed_GM431946152.pdf
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/game-hunters-coin-master-free-spins_GM406889139.pdf
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/my-robux_GM431946152.pdf
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/coin-master-hack-2021_GM406889139.pdf
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-tiktok-fans-no-verification-2021_GM835599320.pdf
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdf
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/roblox-promo-codes-for-free-robux_GM431946152.pdf
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdf
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-coin-master-hacks_GM406889139.pdf
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/minecraft-pe-free_GM479516143.pdf
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-to-get-free-robux-promo-codes_GM431946152.pdf
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/earn-free-robux_GM431946152.pdf
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-spins-on-coin-master-links-2021_GM406889139.pdf
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/hack-xp-net-coin-master_GM406889139.pdf
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/coin-master-free-coins-links-2021_GM406889139.pdf
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/coin-master-daily-spin-free_GM406889139.pdf
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/roblox-bloxburg-hack_GM431946152.pdf
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/coin-master-hack-tool-for-pc_GM406889139.pdf
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-robux-without-any-verification_GM431946152.pdf
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-to-get-free-tiktok-fans_GM835599320.pdf
- http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off000052a1.bin` `00f15261dcd75045c21f92c9bf48a0faf0f1109d46b86d6b1d9b4638341054e7`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x52A1	28496 bytes
`font_01_sfnt_off00009567.bin` `2df87bbe4e27b27e34c872c092d0522acd977d05f5cbde7ed5e1fdfeb59cb318`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9567	2984 bytes
`font_02_sfnt_off00009fb5.bin` `472e826a7e1ecfe5d1b071f470245e0a1b10fe9afd6b83a3e2ebf022ee729568`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9FB5	18572 bytes

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