Malicious PDF — malware analysis report

Static analysis result for SHA-256 683173296f50d8bc…

MALICIOUS

PDF

34.7 KB Created: 2021-06-18 21:54:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5e140f3b304b4bf61e1c44f62314bff3 SHA-1: 102a51b6c5d63bb8e59da075031b9441f7f5bebf SHA-256: 683173296f50d8bcfcf797402b87a7cc24ea0bc44e9091ebb15a974d209b50de
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 presented as download opportunities for game-related cheats and currency. The ML classifier and the presence of a link farm strongly indicate malicious intent, likely to direct users to sites hosting malware or phishing content. 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/robbery-simulator-roblox-cheat-codes-game-hack
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/how-to-get-free-robux-com_GM431946152.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/gamehunters-club-coin-master_GM406889139.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/free-coins-coin-master-link_GM406889139.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/free-coin-and-spin-link_GM406889139.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/how-to-get-800-robux-for-free_GM431946152.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/coin-master-heaven-free-spins_GM406889139.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/free-robux-games-on-roblox_GM431946152.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/coin-master-free-spins-ios-2021_GM406889139.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/scaffold-minecraft-hack_GM479516143.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/minecraft-bedrock-edition-pc-download-free_GM479516143.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/rape-simulator_GM431946152.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/coinmaster-spin-ml-link_GM406889139.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/download-roblox-hack-filesblue_GM431946152.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/coin-master-free-coins-and-spins-link-2021_GM406889139.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/free-roblox-dominus_GM431946152.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/coin-master-spins-hack-iphone_GM406889139.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/is-free-robux-real_GM431946152.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/roblox-free-robux-hack_GM431946152.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdf
    • https://www.ktcart.co.in/uploaded_files/userfiles/files/http-bit-ly-coin-master-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003064.bin
6738ada64c8fecfd33a6ba29a1aa19f2f35a20b360c320fc0848b0158bfad95a
pdf-font-stream PDF embedded font (sfnt) at offset 0x3064 21880 bytes
font_01_sfnt_off000060da.bin
81c22c3cb3dd5f28f61758aabc3b3f830605259b5f1bdf180a5610034f25c9fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x60DA 19632 bytes