Malicious PDF — malware analysis report

Static analysis result for SHA-256 97578c8606471f2c…

MALICIOUS

PDF

35.0 KB Created: 2021-07-08 05:03:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d85b25c74d98e837cc8b0b753060efa5 SHA-1: 225284388c0aa786cf4fe62cb9cf0fbab59888d5 SHA-256: 97578c8606471f2c2aeb0f6369cafbec57369f8d75fda1f5e54ee4a8d9c245ef
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized and appear to be part of a link farm designed to attract users searching for game cheats and free items. The primary URL, http://netcdn.tw/app/431946152/bloxpage-free-robux-game-hack, suggests a direct attempt to deliver a payload or lead to a scam. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious purposes, likely to distribute malware or engage in phishing.

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/431946152/bloxpage-free-robux-game-hack PDF link annotation
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/how-to-bypass-roblox-anti-cheat-cheat-engine-66_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/how-do-you-get-free-robux-on-a-tablet_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/roblox-free-model-teleporting-to-st0p-l00kin-4-siskox_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/awesome-roblox-outfits-for-free_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/free-roblox-promo-codes-that-work_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/mcpe_GM479516143.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/free-spin-link-of-coin-master_GM406889139.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/roblox-god-mode-hack-2021_GM431946152.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_off00003187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3187 22520 bytes
SHA-256: a6385446ddbb2c4cee3dcd506856b340c9be6f3a80e272085c71fb0abff44ce2
font_01_sfnt_off000063f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F7 18968 bytes
SHA-256: 1b5123001528eb502e32e1473b5fef90b38f1688b53074051a1ff9b6b67f8f5e

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