PDF malware analysis — malicious · 9ff53db4b0128179

MALICIOUS

PDF

35.1 KB Created: 2021-06-26 23:47:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16

MD5: a8736023b751fb2a507abfb93ce6ab21 SHA-1: 5e122be756281ebdff080e48f2e61b4ea9a99ce3 SHA-256: 9ff53db4b0128179ecacf13081f79610b58cfaa0d5398c24aac3eddfc049ed8b

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that promotes 'free Robux' and 'free spins' for games, acting as a lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for user deception and potential payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9984

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.co/app/431946152/free-robux-codes-game-hack PDF link annotation
- https://nexsoftech.com/upload/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
- https://nexsoftech.com/upload/userfiles/files/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
- https://nexsoftech.com/upload/userfiles/files/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
- https://nexsoftech.com/upload/userfiles/files/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
- https://nexsoftech.com/upload/userfiles/files/roblox-games-with-free-boombox_GM431946152.pdfIn PDF document text
- https://nexsoftech.com/upload/userfiles/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
- https://nexsoftech.com/upload/userfiles/files/minecraft-free-demo_GM479516143.pdfIn PDF document text
- https://nexsoftech.com/upload/userfiles/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
- https://nexsoftech.com/upload/userfiles/files/free-coin-master-game_GM406889139.pdfIn PDF document text
- https://nexsoftech.com/upload/userfiles/files/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
- https://nexsoftech.com/upload/userfiles/files/minecraft-net-free_GM479516143.pdfIn PDF document text
- https://nexsoftech.com/upload/userfiles/files/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
- https://nexsoftech.com/upload/userfiles/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
- https://nexsoftech.com/upload/userfiles/files/new-codes-speed-hack-roblox-jailbreak-mai-2021_GM431946152.pdfIn PDF document text
- https://nexsoftech.com/upload/userfiles/files/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
- https://nexsoftech.com/upload/userfiles/files/free-robux-mobile_GM431946152.pdfIn PDF document text
- https://nexsoftech.com/upload/userfiles/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
- https://nexsoftech.com/upload/userfiles/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
- https://nexsoftech.com/upload/userfiles/files/robux-hacks-2021-on-a-hp-computer_GM431946152.pdfIn PDF document text
- https://nexsoftech.com/upload/userfiles/files/how-to-make-audio-on-roblox-for-free_GM431946152.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00003153.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3153	22864 bytes
SHA-256: `752549435fa4d14d4fea935a731a96fecee3af5d5e90d0ae50ec79a460e4d8b7`
`font_01_sfnt_off000064c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64C4	18888 bytes
SHA-256: `0b210ae1d2f25d9b8ac974921f9fa88679103a832855b836aa7747c7a59cf8bc`

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