PDF malware analysis — malicious · 4056c8439f998fdb

MALICIOUS

PDF

45.4 KB Created: 2021-05-16 20:23:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: 4d1dcd76700521d3505ee50175e6b4ec SHA-1: a2d91b6f9c3b4d3c8458749e9a99cea2f78d3e07 SHA-256: 4056c8439f998fdb859507d2c696ad4f1bcc97b4aabdb6a85f01805cc0304346

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a fake CAPTCHA lure to trick users into downloading applications. It also hosts a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL identified is associated with downloading modded applications.

Machine Learning

Nyx PDF Classifier malicious score 0.9507

Heuristics 5

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.
Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA

Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
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/406889139/coin-master-latest-mod-apk-free-download-game-hack
- http://www.mucinvitinh.vn/public/images/image_uploads/files/links-to-get-free-spins-on-coin-master_GM406889139.pdf
- http://www.mucinvitinh.vn/public/images/image_uploads/files/minecraft-bedrock-download-pc-free_GM479516143.pdf
- http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-free-spins-link-31-march-2021_GM406889139.pdf
- http://www.mucinvitinh.vn/public/images/image_uploads/files/can-i-get-robux-for-free_GM431946152.pdf
- http://www.mucinvitinh.vn/public/images/image_uploads/files/how-to-get-free-followers-on-roblox_GM431946152.pdf
- http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-hack-app_GM406889139.pdf
- http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-hack-app-download-free_GM406889139.pdf
- http://www.mucinvitinh.vn/public/images/image_uploads/files/latest-coin-master-free-spins-link_GM406889139.pdf
- http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-gameplay_GM406889139.pdf
- http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-promo-code-2021_GM406889139.pdf
- http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-free-spin-link-today-2021_GM406889139.pdf
- http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-free-coins-and-spins-group_GM406889139.pdf
- http://www.mucinvitinh.vn/public/images/image_uploads/files/how-do-i-get-robux_GM431946152.pdf
- http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-hack-apk-july-2021_GM406889139.pdf
- http://www.mucinvitinh.vn/public/images/image_uploads/files/free-robux-websites-no-human-verification_GM431946152.pdf
- http://www.mucinvitinh.vn/public/images/image_uploads/files/free-roblox-followers-generator_GM431946152.pdf
- http://www.mucinvitinh.vn/public/images/image_uploads/files/how-to-get-free-robux-no-verification_GM431946152.pdf
- http://www.mucinvitinh.vn/public/images/image_uploads/files/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdf
- http://www.mucinvitinh.vn/public/images/image_uploads/files/rblx-gg-free-robux_GM431946152.pdf
- http://www.mucinvitinh.vn/public/images/image_uploads/files/free-spin-and-coin-links_GM406889139.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_off00004ba7.bin` `cc45472f61f8306c66af08787233d224a73a347b6f2ef67fa253bb1ff15129ab`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4BA7	24812 bytes
`font_01_sfnt_off00008403.bin` `10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8403	2880 bytes
`font_02_sfnt_off00008dee.bin` `e64e7c68c640d7a76083afd8b9b2f812e6e5e3722298a9911c500c059d2c6a5e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8DEE	18636 bytes

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