Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e3900a41861651…

MALICIOUS

PDF

35.7 KB Created: 2021-07-04 12:26:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d09d76cbbfc22c1b28aab46be2d1a84c SHA-1: ba6d9b91fe3a674a7f0454e5f1ea82cadf2246b6 SHA-256: 43e3900a418616510b78ecebe5175fd56d18324751c3e183bc997f3c4ca95aca
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a document body referencing game hacks and cheats 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 drive traffic to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to click these links, which likely lead to malware downloads or phishing pages.

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/free-daily-spins-coin-master-2021-game-hack
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/coin-master-20-free-spins-link-today_GM406889139.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/wurst-115-2_GM479516143.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/free-robux-promo-codes-2021-no-inspect_GM431946152.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/how-to-get-free-admin-in-roblox_GM431946152.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/roblox-devil_GM431946152.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/roblox-robux-hack-generator_GM431946152.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/coin-master-free-spin-facebook-link_GM406889139.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/daily-spin-and-coin_GM406889139.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/coin-master-free-spin-ml_GM406889139.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/free-roblox-hair-codes_GM431946152.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/100-hack-coin-master_GM406889139.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-and-coins_GM406889139.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/cheats-for-pizza-place-roblox_GM431946152.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/minecraft-free-download-laptop_GM479516143.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/how-to-hack-a-roblox-account-2021_GM431946152.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/no-human-verification-hack-for-coin-master_GM406889139.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/how-to-get-free-robux-google_GM431946152.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox-app_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003266.bin
6f75857f608f56e67a8606a2ca0cfb2228cc5b369bac5ba4d1c5b10a0e65b45b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3266 23112 bytes
font_01_sfnt_off00006696.bin
bff5cd883eb4370b15e965f4fd1aca22479e39b86b51e1d2e4068a25e0992d6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6696 19000 bytes

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