Malicious PDF — malware analysis report

Static analysis result for SHA-256 7036b1eb2b1ac55b…

MALICIOUS

PDF

33.2 KB Created: 2021-06-25 03:44:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c7b6b0a11f68336b0b2e8240ed034226 SHA-1: 0240713d3ac0007faa8acdb31067e1414d7e2822 SHA-256: 7036b1eb2b1ac55be641c6cf39a5397ce5d0b3ed2dad4dbcc34202eacae9e3e3
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 structured as SEO-optimized PDF links, suggesting a link farm designed to drive traffic. The primary URL and many others point to "free Robux" hacks, indicating a lure for users seeking in-game currency. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/free-robux-hack-2021-pastebin-game-hack PDF link annotation
    • http://library.sdkmaterdei.sch.id/repository/how-to-get-free-packs-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/how-to-earn-a-ton-of-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/roblox-shuts-down-when-i-open-cheat-engine_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/download-roblox-jailbreak-money-hack_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/youtube-roblox-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-robux-codes-not-used-2021-july_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/hack-jailbreak-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/roblox-caveman-simulator-hack-script_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/2021-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/how-to-get-free-robux-100-real-pc_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/how-to-get-free-robux-on-ios-2021_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/prison-life-speed-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/how-to-get-free-roblox-hacks_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_off00002b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B0B 21904 bytes
SHA-256: 3e5bd2307fca0d89e9e3b20a9688006b18b524607755a950e9f8aae64d5fd8d8
font_01_sfnt_off00005b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B52 19664 bytes
SHA-256: 0c018a2a755c6ea3b84bcad43cc4d6e513b86b628f86e9ee7bfe64bcb323731a

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