Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b723ee6c770b6da…

MALICIOUS

PDF

35.4 KB Created: 2021-06-28 22:12:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3744c9c3d55862ea03a4508e6d06d194 SHA-1: 542e5acb8915b9d097cb1fab11fc0c80c59dd473 SHA-256: 9b723ee6c770b6da7c6bc9f12ec8f34761baab1c1ee0871bd923a3e33d2090f3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs promising free Robux or game hacks. The primary URL, http://netcdn.co/app/431946152/how-to-free-robux-on-computer-game-hack, likely serves as a lure to download a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

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/how-to-free-robux-on-computer-game-hack PDF link annotation
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-pc-2021_GM431946152.pdfIn PDF document text
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/how-to-get-free-robux-easy-no-download-2021_GM431946152.pdfIn PDF document text
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/free-cool-things-in-roblox-that-charecters-played_GM431946152.pdfIn PDF document text
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/how-to-actually-fly-hack-n-roblox-fe2_GM431946152.pdfIn PDF document text
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-putting-in-your-password_GM431946152.pdfIn PDF document text
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/free-robux-2021-no-survey-no-download_GM431946152.pdfIn PDF document text
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/roblox-bus-simulator-hack_GM431946152.pdfIn PDF document text
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/roblox-swear-hacks-script_GM431946152.pdfIn PDF document text
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/how-to-hack-level-on-roblox-paintball_GM431946152.pdfIn PDF document text
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/roblox-free-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/roblox-mm2-hack-para-tener-godly-2021_GM431946152.pdfIn PDF document text
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/roblox-how-to-get-free-robux-glitch_GM431946152.pdfIn PDF document text
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/treasure-hunrt-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/how-to-hack-draw-it-roblox_GM431946152.pdfIn PDF document text
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3298 22408 bytes
SHA-256: e490088d4c32501e6ad3aad0c04e9068dd731396619e87652bcb1b4376f5b093
font_01_sfnt_off00006428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6428 19420 bytes
SHA-256: bbd9620f34cf71ac8749be64d867261bbd865e99c38e0d2002e367f579170927

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