Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52a5b93114a7a7d…

MALICIOUS

PDF

35.1 KB Created: 2021-06-22 20:41:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: df19a82dfae9eba6a714f83c026331c5 SHA-1: d0ccff5cf74c4a8755515edb3828ad51f587192f SHA-256: b52a5b93114a7a7dedd16c5ac6eeaca14009066d8925e7f8b9f738231825995c
122 Risk Score

Malware Insights

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

The PDF document contains numerous links, including a primary malicious URL, that are designed to lure users into downloading potentially harmful files by promising free in-game items. The ML classifier strongly indicated maliciousness, and the presence of a link farm and a download button lure further support this assessment. The document's content and structure are consistent with a phishing or scam attempt.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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-do-you-get-free-roblox-game-hack
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-daily-free-spins-link-app_GM406889139.pdf
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coin-master-spins-for-today_GM406889139.pdf
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-spin-link-today-free_GM406889139.pdf
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-someone-on-roblox_GM431946152.pdf
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spin-in-coin-master_GM406889139.pdf
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdf
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/pubg-uc-and-skins-buy_GM1330123889.pdf
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/get-free-spins-on-coin-master_GM406889139.pdf
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/what-games-give-you-robux_GM431946152.pdf
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/bloxland-earn-free-robux_GM431946152.pdf
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/free-roblox-shirt-templates_GM431946152.pdf
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-generator-2021_GM431946152.pdf
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdf
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/easy-ways-to-get-free-robux_GM431946152.pdf
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-offline-hack_GM406889139.pdf
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/hack-bubble-gum-simulator-roblox_GM431946152.pdf
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/master-coin-hack-mod_GM406889139.pdf
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-online_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031f7.bin
b2bd89d608807b0f48dd0b2d85530914b28fab4c7b59e37fcc6a3b630290ecb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31F7 22296 bytes
font_01_sfnt_off0000634a.bin
ad78cfc62cd8c1b058715f2dc66a6bf5ac5c09636f1ae08381e96b56faa7ef77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x634A 19388 bytes

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