Malicious PDF — malware analysis report

Static analysis result for SHA-256 5539b3e13068dc42…

MALICIOUS

PDF

33.8 KB Created: 2021-07-08 10:50:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f84d0beaae25bc23277ef6cf98f3ab3d SHA-1: 1a8ee7da92282fce881b75eeed2c18de0d914b76 SHA-256: 5539b3e13068dc428948f790403ddaa4cea5867cc2703f3f30fa70f998bb671e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document contains numerous links disguised as content related to game hacks and cheats, impersonating brands like PayPal. The primary malicious URL, http://netcdn.tw/app/431946152/how-to-hack-roblox-game-hack, is likely intended to lead users to a credential harvesting page or a malware download. The extensive link farm and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/431946152/how-to-hack-roblox-game-hack.
  • 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/how-to-hack-roblox-game-hack PDF link annotation
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/roblox-hackprogamers-com_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/cheats-for-robux-2021_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/bleach-soul-of-end-roblox-hack_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/free-gucci-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/coin-master-mod-apk-hack_GM406889139.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/free-robux-no-download-or-email_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/roblox-cheat-with-fake-paypal_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/how-to-get-free-skins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/how-to-save-hacked-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/coin-master-free-spins-hack-download_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_off00002ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ECB 22156 bytes
SHA-256: 4187269154669b3b866f35b6078f79defc00e448c19f4f1cf6cb834c8c99253d
font_01_sfnt_off00005f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9B 18820 bytes
SHA-256: bc289db47467c627b75bad478044969f7c78c51a6f1934d82e9e517bf2978efd

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