Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6f3896e27d27d2…

MALICIOUS

PDF

45.8 KB Created: 2021-05-14 11:34:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: abdf396f36225f1743720948b983fb22 SHA-1: 7a0250ba89ef794816480974c5abec72637d209f SHA-256: ed6f3896e27d27d27c49c0b17ee2a6f66088b641d686daff3cb7dfb36e107988
82 Risk Score

Malware Insights

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

The sample is a PDF document that displays a fake CAPTCHA or human verification prompt, a common social engineering tactic to trick users into interacting with malicious content. It also contains an embedded URI pointing to a suspicious URL, likely intended to host a secondary payload or redirect the user to a phishing site. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.xyz/app/406889139/free-spins-for-coin-master-hack-game-hack
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/instant-free-spins-coin-master_GM406889139.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-with-no-survey_GM431946152.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-daily-free-coins-link-today_GM406889139.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/boost9-com-roblox-hack_GM431946152.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-400-spins-coins-master_GM406889139.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coin-master-coins-2021_GM406889139.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-apk-2021_GM406889139.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-hacks-115-2_GM479516143.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-today_GM431946152.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/earn-robux-now_GM431946152.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-rewards-robux_GM431946152.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/hacking-apps-for-roblox_GM431946152.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/twitter-coin-master-free-spins-link_GM406889139.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/get-free-robux-no-verification_GM431946152.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-hackhub-coin-master_GM406889139.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/facebook-coin-master-free-spins-link_GM406889139.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-hack-codes_GM431946152.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d8e.bin
27917558e0ca634939dc9d11fc9a932ed850245a2536cd60cadd5496a4c7c2bd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D8E 25396 bytes
font_01_sfnt_off0000877e.bin
3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x877E 2840 bytes
font_02_sfnt_off0000912f.bin
3401c90f9da97577ae440e5622d1e8fed8a056e7e09ad8fa85d1e768b8d8a9bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x912F 18056 bytes

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