Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0cbc33fab8311f…

MALICIOUS

PDF

34.6 KB Created: 2021-07-09 01:20:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4eddba201c53c1c049d7aff8b8cc9698 SHA-1: 42243c89bfc376c750f14cd9b1969d1c1753729c SHA-256: 8c0cbc33fab8311fc572d24de145599a73a8ff06b827b79fa8242ac9c83e187a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, primarily offering 'free coins' and 'hacks' for popular games like Coin Master and Roblox. The ML classifier and PDF link farm heuristics strongly indicate malicious intent. The presence of a 'password-protected archive handoff' lure suggests a multi-stage attack where the PDF serves as a lure to obtain further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-free-coins-game-hack
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/coin-master-claim-free-spins_GM406889139.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/roblox-high-school-for-free-to-play_GM431946152.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/how-to-use-winrar-for-hacks-roblox_GM431946152.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/usernames-and-passwords-hack-roblox_GM431946152.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/coin-master-free-spin-and-coins-links_GM406889139.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/minecraft-pocket-edition-free-download_GM479516143.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/how-many-villages-are-in-coin-master_GM406889139.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/get-free-robux-info_GM431946152.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/free-egg-roblox-eggcellent_GM431946152.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/roblox-help-free-robux_GM431946152.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/spin-coin-master_GM406889139.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/hack-coin-master-apk-2021_GM406889139.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/hacks-to-get-free-robux_GM431946152.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/como-hackear-coin-master-espaol_GM406889139.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/cheats-for-royale-high-school-on-roblox_GM431946152.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/how-to-get-free-coins-in-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032a9.bin
30880bded796208cf68c6f43c7ca481fb87ad8e14dc7e054f654c7cf10216c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x32A9 22728 bytes
font_01_sfnt_off00006570.bin
2ec206c530faa3d40eac36f14655b3e9b935e9ff12c648634e177d5bc9421463		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6570 17996 bytes

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