Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7ea95fcd967c2f…

MALICIOUS

PDF

33.9 KB Created: 2021-06-26 18:29:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c0587113f1f0e9265b814ccb2080309f SHA-1: 7ef609fe5b22a46e90ea925c18864bd147ab5519 SHA-256: ee7ea95fcd967c2f35e2bc9b872e43c99057e692afbf617726f8251e175a14f0
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which are part of a link farm, all directing users towards websites promising free in-game currency or cheats for popular games like Roblox and Coin Master. The presence of a "download button" heuristic and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites or engage them in scam activities. No scripts were extracted from this sample.

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.co/app/431946152/earnbux-us-free-robux-game-hack
    • https://www.iosas.info/uploaded_files/userfiles/files/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdf
    • https://www.iosas.info/uploaded_files/userfiles/files/roblox-typing-cheat-to-get-money-on-blox-burg_GM431946152.pdf
    • https://www.iosas.info/uploaded_files/userfiles/files/claim-gg-free-robux_GM431946152.pdf
    • https://www.iosas.info/uploaded_files/userfiles/files/free-robux-for-xbox-for-kids_GM431946152.pdf
    • https://www.iosas.info/uploaded_files/userfiles/files/roblox-font-free_GM431946152.pdf
    • https://www.iosas.info/uploaded_files/userfiles/files/free-minecraft-alts_GM479516143.pdf
    • https://www.iosas.info/uploaded_files/userfiles/files/roblox-how-to-get-free-pet_GM431946152.pdf
    • https://www.iosas.info/uploaded_files/userfiles/files/hack-coin-master-no-human-verification_GM406889139.pdf
    • https://www.iosas.info/uploaded_files/userfiles/files/roblox-how-to-kick-players-with-cheat-engine_GM431946152.pdf
    • https://www.iosas.info/uploaded_files/userfiles/files/coin-master-free-spins-link-download-ios_GM406889139.pdf
    • https://www.iosas.info/uploaded_files/userfiles/files/roblox-free-robux-no-verification_GM431946152.pdf
    • https://www.iosas.info/uploaded_files/userfiles/files/youtube-how-to-get-free-robux_GM431946152.pdf
    • https://www.iosas.info/uploaded_files/userfiles/files/free-premium-roblox_GM431946152.pdf
    • https://www.iosas.info/uploaded_files/userfiles/files/hack-robux-without-human-verification_GM431946152.pdf
    • https://www.iosas.info/uploaded_files/userfiles/files/daily-spin-and-coin_GM406889139.pdf
    • https://www.iosas.info/uploaded_files/userfiles/files/free-roblox-catalog-buyer-bot_GM431946152.pdf
    • https://www.iosas.info/uploaded_files/userfiles/files/free-robux-codes-no-verification_GM431946152.pdf
    • https://www.iosas.info/uploaded_files/userfiles/files/robux-hack-me_GM431946152.pdf
    • https://www.iosas.info/uploaded_files/userfiles/files/how-to-hack-roblox-prison-life-mobile_GM431946152.pdf
    • https://www.iosas.info/uploaded_files/userfiles/files/apps-that-give-you-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f8c.bin
c1e2bec3720851eac37095a93c48ecd00874d1562b828ef02f621d94a1969fcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x2F8C 22164 bytes
font_01_sfnt_off00006093.bin
3d077f6ea0d0efc29c3789347c1e2fd7b14a6ce518dc1c07f22f329e2897cab6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6093 18716 bytes