Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9633fd810c0decf…

MALICIOUS

PDF

34.4 KB Created: 2021-07-09 17:32:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 622b1a8502ea28f40495423c2d4c0861 SHA-1: fd5eee5e15f32a6acf8b22aa09f96679be1dee05 SHA-256: f9633fd810c0decf2366835da9b8eeff90abd9e859f2660d51da7d78eafc5d81
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a document body that promotes fake hacks and free currency for popular games like Coin Master and Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users with deceptive content. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is designed to trick users into downloading potentially harmful files or visiting malicious sites.

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/406889139/coin-master-hack-download-android-game-hack
    • http://www.elsire.co.in/uploaded_files/userfiles/files/pokemon-go-free-pokemon-generator_GM1094591345.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/links-for-free-spins-for-coin-master_GM406889139.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/spin-coin-master-free_GM406889139.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/bimsqa-complex-gives-free-robux_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/coin-master-spin-hack-pc_GM406889139.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/free-minecraft-java-edition-codes_GM479516143.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/how-to-get-a-lot-of-robux_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/how-to-get-any-hat-on-roblox-for-free-2021_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/bypass-roblox-cheat-engine_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/roblox-place-rewards_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/how-to-get-any-gamepass-on-roblox-for-free-2021_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/robux-club-free_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/free-robux-offers_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/how-to-get-free-spins-coin-master_GM406889139.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/free-script-runner-for-roblox_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/hacking-roblox-items_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/free-robux-with-no-human-verification_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/minecraft-free-demo_GM479516143.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/enter-a-code-for-free-robux_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/roblox-login-and-play-for-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003026.bin
02dc2f07b9a282e52e9b64829384150658457ac509225c94b5cb126d34f74833		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3026 22632 bytes
font_01_sfnt_off000062ac.bin
764db0c8bb3cc5d56384d8faf66ab9aae998b336e4984509afe0aadec95ec4ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62AC 18584 bytes

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