Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8887c8c3081c8b…

MALICIOUS

PDF

33.4 KB Created: 2021-07-04 06:05:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6e838c78b17a8ff75940985d0351a136 SHA-1: 2f0d5c172094cd8ee37e58bbe027084f25e9872a SHA-256: 2e8887c8c3081c8b0e1991e40786cc2d8e2b597e706c1a321bf7bf9abafbf2e6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links to external websites, many of which are structured as SEO link farms for game hacks and virtual currency. The ML classifier strongly indicated maliciousness, and the presence of a download button lure further supports a malicious intent. The primary goal appears to be directing users to download potentially unwanted or malicious software from the linked URLs.

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.tw/app/479516143/minecraft-mac-free-game-hack
    • http://proyetec.com.co/aym_image/files/how-to-get-free-robux-easy-no-download_GM431946152.pdf
    • http://proyetec.com.co/aym_image/files/minecraft-free-download-laptop_GM479516143.pdf
    • http://proyetec.com.co/aym_image/files/how-to-get-free-robux-no-human-verification_GM431946152.pdf
    • http://proyetec.com.co/aym_image/files/google-how-do-you-get-free-robux_GM431946152.pdf
    • http://proyetec.com.co/aym_image/files/avatar-de-roblox_GM431946152.pdf
    • http://proyetec.com.co/aym_image/files/how-to-get-free-premium-roblox_GM431946152.pdf
    • http://proyetec.com.co/aym_image/files/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdf
    • http://proyetec.com.co/aym_image/files/hack-client-for-counter-blox-roblox-offensive_GM431946152.pdf
    • http://proyetec.com.co/aym_image/files/free-minecraft-realms-to-join_GM479516143.pdf
    • http://proyetec.com.co/aym_image/files/get-me-free-robux_GM431946152.pdf
    • http://proyetec.com.co/aym_image/files/free-robux-gg-codes-php_GM431946152.pdf
    • http://proyetec.com.co/aym_image/files/100-working-robux-hack_GM431946152.pdf
    • http://proyetec.com.co/aym_image/files/download-coin-master-hack_GM406889139.pdf
    • http://proyetec.com.co/aym_image/files/coin-master-home_GM406889139.pdf
    • http://proyetec.com.co/aym_image/files/hack-in-roblox-download_GM431946152.pdf
    • http://proyetec.com.co/aym_image/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://proyetec.com.co/aym_image/files/pokemon-go-free-accounts-list_GM1094591345.pdf
    • http://proyetec.com.co/aym_image/files/coin-master-free-coins-amp_GM406889139.pdf
    • http://proyetec.com.co/aym_image/files/roblox-girl_GM431946152.pdf
    • http://proyetec.com.co/aym_image/files/how-to-get-robux-in-roblox-not-cheating_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003024.bin
2123386873df3341de4a2dd21a3520d09b186345d56722bf818dbfc7361cf1c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x3024 22132 bytes
font_01_sfnt_off00006156.bin
cc1e3add4a04a98446b1b55314af2162444863ccaf169a3449495116b9daf471
pdf-font-stream PDF embedded font (sfnt) at offset 0x6156 17856 bytes