Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8a83ec794971fb…

MALICIOUS

PDF

43.4 KB Created: 2021-05-18 04:03:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 870444b7295eb6bd866cab94c9fd762c SHA-1: 0504c09ffb30223ec2d9eabd361715cf49662959 SHA-256: 7e8a83ec794971fb00298eba86fee6c34a764f67e33ba8db6650455f23518adc
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which are disguised as downloadable documents with SEO-friendly titles. The primary external URL points to content related to hacking Roblox accounts, suggesting a lure for potentially malicious downloads or scams. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/how-to-hack-someone
    • http://hometech.tw/ckfinder/userfiles/files/how-to-make-a-minecraft-client_GM479516143.pdf
    • http://hometech.tw/ckfinder/userfiles/files/hey-google-how-do-you-get-free-robux_GM431946152.pdf
    • http://hometech.tw/ckfinder/userfiles/files/free-ways-to-get-robux_GM431946152.pdf
    • http://hometech.tw/ckfinder/userfiles/files/free-spins-coin-master-links-no-human-verification_GM406889139.pdf
    • http://hometech.tw/ckfinder/userfiles/files/is-minecraft-education-edition-free_GM479516143.pdf
    • http://hometech.tw/ckfinder/userfiles/files/hack-coin-master-app-ios_GM406889139.pdf
    • http://hometech.tw/ckfinder/userfiles/files/minecraft-bedrock-edition-pc-free_GM479516143.pdf
    • http://hometech.tw/ckfinder/userfiles/files/coin-master-unlimited-spin-link_GM406889139.pdf
    • http://hometech.tw/ckfinder/userfiles/files/free-spins-coin-master-daily_GM406889139.pdf
    • http://hometech.tw/ckfinder/userfiles/files/how-to-get-minecraft-pe-for-free_GM479516143.pdf
    • http://hometech.tw/ckfinder/userfiles/files/hacks-for-coin-master-game_GM406889139.pdf
    • http://hometech.tw/ckfinder/userfiles/files/coin-master-hack-tool-india_GM406889139.pdf
    • http://hometech.tw/ckfinder/userfiles/files/free-coin-coin-master_GM406889139.pdf
    • http://hometech.tw/ckfinder/userfiles/files/roblox-money-hack_GM431946152.pdf
    • http://hometech.tw/ckfinder/userfiles/files/coin-master-free-spins-promo-code_GM406889139.pdf
    • http://hometech.tw/ckfinder/userfiles/files/robux-online_GM431946152.pdf
    • http://hometech.tw/ckfinder/userfiles/files/spin-link_GM406889139.pdf
    • http://hometech.tw/ckfinder/userfiles/files/www-roblox-com-robux-free_GM431946152.pdf
    • http://hometech.tw/ckfinder/userfiles/files/earn-free-robux-for-roblox_GM431946152.pdf
    • http://hometech.tw/ckfinder/userfiles/files/free-spins-coin-master-october-13-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004896.bin
e513f0fedc83fa9a75959a139aace5c670f34662567a125ae645a3aef8cc7a36
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4896 25880 bytes
font_01_sfnt_off000083d8.bin
0830f2bc2b032c7ad37be74462a8461862374830fa053aba1852b18e492c5f08
pdf-font-stream PDF embedded font (sfnt) at offset 0x83D8 19316 bytes