PDF malware analysis — malicious · 5d66416a131ffa24

MALICIOUS

PDF

44.9 KB Created: 2021-05-16 18:43:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: 81da1b0a8f9883258ff3d46fad8b9b3a SHA-1: e649dbcb4425b2e06038cc4a603d6c9d3949d64f SHA-256: 5d66416a131ffa24359795106332dc97f0f56d138f627f845441937f21db9db0

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are related to obtaining free Robux or game hacks, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, also contains URLs related to free Robux, reinforcing the 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 https://netcdn.xyz/app/431946152/websites-to-get-free-robux-game-hack
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-for-free_GM431946152.pdf
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/roblox-comcom_GM431946152.pdf
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/rbx-robux_GM431946152.pdf
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-spin-coin-master-link-2021_GM406889139.pdf
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-spin-coin-master-ios_GM406889139.pdf
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-hack-version-download-2021-android_GM406889139.pdf
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-robux-cards_GM431946152.pdf
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-daily-link-updated_GM406889139.pdf
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-coins_GM406889139.pdf
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-pc-hack-tool_GM406889139.pdf
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-do-you-get-free-roblox_GM431946152.pdf
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/youtube-how-to-get-free-robux_GM431946152.pdf
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-hack-m-coins-mcpe-master_GM406889139.pdf
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-get-free-premium-roblox_GM431946152.pdf
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/minecraft-java-free_GM479516143.pdf
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-robux-no-verification-needed_GM431946152.pdf
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-change-your-roblox-username-for-free_GM431946152.pdf
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-hack-ios-download_GM406889139.pdf
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdf
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-robux-only-username-no-human-verification_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_003_off00004ba8.bin` `655944ce06df7094aa93452ea66ae950337ade589019414fb95f30e5482f509b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4BA8	29048 bytes
`font_01_sfnt_off00008ccd.bin` `6ab9ab31980840835fbaeca164a74f0e8188db39a6ce5c5e4face3e95ba0b523`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8CCD	18436 bytes

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