PDF malware analysis — malicious · f7dc5ddd1d56081a

MALICIOUS

PDF

35.3 KB Created: 2021-06-25 13:56:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16

MD5: 8a91e1d87288ce7b8feb5f283ea08460 SHA-1: 87aa757149797c109b9acae8d5106ea6b112d79d SHA-256: f7dc5ddd1d56081a275e7d72c698fb3e58644a750885476fba13eefeff33e135

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which are part of a link farm designed to attract users with promises of free game items and currency. The ML classifier strongly indicates maliciousness, and the presence of a download button lure further supports a malicious intent. The primary attack pattern involves directing users to potentially malicious external sites via these links.

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.co/app/431946152/flamingo-free-shirt-templates-roblox-game-hack PDF link annotation
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/join-roblox-builders-club-free_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/roblox-character-free_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/how-can-you-get-free-robux-on-laptops-on-roblox_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/coinmaster-fan-page_GM406889139.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/roblox-jjsploit-money-hack-any-game_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-without-passwords_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/minecraft-free-download_GM479516143.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-facebook_GM406889139.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_off000031eb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x31EB	22480 bytes
SHA-256: `d824f956e8accbb4719e30d3eead2e5b2c18fb7cc5d586114fce6652cc51ff03`
`font_01_sfnt_off0000640f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x640F	19476 bytes
SHA-256: `347a183af3db1cb7a46ad8708f45dcba963b351eef9865c3fadf0d630bf95e8c`

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