Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40dadaf2f63e952…

MALICIOUS

PDF

35.7 KB Created: 2021-06-27 09:20:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: acd80dd83dd0678a7b90e411925befba SHA-1: e2eb101a6761c5be2b9cc196980e4e179c0ab3c8 SHA-256: e40dadaf2f63e952579618fcf11941dbcb8c2d7d11909c1469c022f58a1e48e4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a malicious SEO link farm, designed to attract users searching for game cheats and virtual currency. The document contains numerous embedded URLs pointing to other PDFs, many of which are titled with keywords like 'free Robux' or 'hack'. The primary URL, http://netcdn.co/app/431946152/free-robux-codews-game-hack, likely serves as a lure to a malicious download or exploit. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the deceptive linking strategy.

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/free-robux-codews-game-hack
    • https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master-with-lucky-patcher_GM406889139.pdf
    • https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/coin-master-free-spin-best-link_GM406889139.pdf
    • https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/hack-roblox-lumber-tycoon-2-money_GM431946152.pdf
    • https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/do-coin-master-hacks-work_GM406889139.pdf
    • https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/moonactive-coin-master-free-spins-link_GM406889139.pdf
    • https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/how-you-get-robux_GM431946152.pdf
    • https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/minecraft-java-free-account_GM479516143.pdf
    • https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/free-robux-scams_GM431946152.pdf
    • https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/roblox-free-robux_GM431946152.pdf
    • https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/free-roblox-promo-codes-for-robux_GM431946152.pdf
    • https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/can-you-host-a-minecraft-server-for-free_GM479516143.pdf
    • https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-realms-for-free_GM479516143.pdf
    • https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-daily-link-updated_GM406889139.pdf
    • https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/coin-master-hack-mod-apk_GM406889139.pdf
    • https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/coin-master-free-spins--spins_GM406889139.pdf
    • https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/free-coin-and-spin-for-coin-master_GM406889139.pdf
    • https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/free-robux-accounts-2021_GM431946152.pdf
    • https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/free-coins-coin-master-spins_GM406889139.pdf
    • https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/heurne-free-robux_GM431946152.pdf
    • https://elearning.man1karawang.sch.id/__statics/gudangsoal/files/free-robux-no-survey_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003354.bin
e8d8cf03edbbb27931d6b492a958a80f9acd0b50431c61854b93abd16031006b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3354 22704 bytes
font_01_sfnt_off00006679.bin
c7845d0b6d9a9c429c52544de19d45576ec97c3c0a01e0c6f41aafa7df63aa03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6679 19056 bytes

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