Malicious PDF — malware analysis report

Static analysis result for SHA-256 d709bdcd123d25e7…

MALICIOUS

PDF

35.6 KB Created: 2021-07-03 18:16:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4fb18401a3cdb3487b4c98fe2b434573 SHA-1: 30bf07823ba18f7057aab33824fa367624c5ba4e SHA-256: d709bdcd123d25e7dab9382d01f7f29b997a0ad245ccc27fcaf28b9fc4a6ca44
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a DOC BODY that explicitly mentions 'Coin Master Hack Apk' and links to external resources. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to distribute malicious content. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern involves luring users to download potentially harmful applications.

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-apk-ios-game-hack
    • https://www.ramsburyestates.co.uk/uploads/files/files/coin-master-attack-madness-hack_GM406889139.pdf
    • https://www.ramsburyestates.co.uk/uploads/files/files/free-spins-generated-from-coin-master_GM406889139.pdf
    • https://www.ramsburyestates.co.uk/uploads/files/files/how-to-hack-and-get-free-robux_GM431946152.pdf
    • https://www.ramsburyestates.co.uk/uploads/files/files/how-to-get-free-robux-inspect_GM431946152.pdf
    • https://www.ramsburyestates.co.uk/uploads/files/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdf
    • https://www.ramsburyestates.co.uk/uploads/files/files/coin-master-viking-quest-hack_GM406889139.pdf
    • https://www.ramsburyestates.co.uk/uploads/files/files/coin-master-hack-cheat-generator-d_GM406889139.pdf
    • https://www.ramsburyestates.co.uk/uploads/files/files/will-minecraft-dungeons-be-free_GM479516143.pdf
    • https://www.ramsburyestates.co.uk/uploads/files/files/blox-best-robux_GM431946152.pdf
    • https://www.ramsburyestates.co.uk/uploads/files/files/free-spins-for-coin-master-game_GM406889139.pdf
    • https://www.ramsburyestates.co.uk/uploads/files/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdf
    • https://www.ramsburyestates.co.uk/uploads/files/files/can-you-play-minecraft-for-free_GM479516143.pdf
    • https://www.ramsburyestates.co.uk/uploads/files/files/how-to-get-free-robux-on-roblox_GM431946152.pdf
    • https://www.ramsburyestates.co.uk/uploads/files/files/free-robux-safe_GM431946152.pdf
    • https://www.ramsburyestates.co.uk/uploads/files/files/roblox-jailbreak-hack-download_GM431946152.pdf
    • https://www.ramsburyestates.co.uk/uploads/files/files/free-coins-coin-master_GM406889139.pdf
    • https://www.ramsburyestates.co.uk/uploads/files/files/free-spins-on-coin-master-app_GM406889139.pdf
    • https://www.ramsburyestates.co.uk/uploads/files/files/minecraft-bedrock-edition-pc-download-free_GM479516143.pdf
    • https://www.ramsburyestates.co.uk/uploads/files/files/how-to-hack-roblox-on-mobile_GM431946152.pdf
    • https://www.ramsburyestates.co.uk/uploads/files/files/how-to-get-free-coins-on-tiktok_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003457.bin
70d38d2b306bca42a48ede22bdbe3a8abeab42e26269f1e67cbc99bee8614c86
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3457 23196 bytes
font_01_sfnt_off000068cf.bin
669191ced257cad8cf719fd096a029eb32cc90bb1eacba4ce7ed61202962bed4
pdf-font-stream PDF embedded font (sfnt) at offset 0x68CF 18180 bytes