Malicious PDF — malware analysis report

Static analysis result for SHA-256 40afecb1ceafc465…

MALICIOUS

PDF

52.3 KB Created: 2021-06-03 09:57:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 46958f58062f0fd13090e7f383e7f7e9 SHA-1: d61944229b881ae895f32b615308881201ba5a5c SHA-256: 40afecb1ceafc46537f4776600d7c3d62e505df355e0a31b6be80a09fe6bea83
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick users into interacting with it, likely to download a secondary payload from the embedded URL. The ML classifier also flagged this PDF as malicious. The primary IOC is the URL embedded within the document body.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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.online/app/431946152/how-to-get-free-robux-without-email-game-hack PDF link annotation
    • https://www.thekukkad.com/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/robux-gainer_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/roblox-re_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/roblox-cheat-robux_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/coin-master-hack-ios-12_GM406889139.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/hackear-juego-coin-master-espaol_GM406889139.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/free-tiktok-likes-no-survey_GM835599320.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5457 25604 bytes
SHA-256: 2bbaec2c6ab778634c05e1df8e71738eb99db5d028edd036df2fb27b730f580b
font_01_sfnt_off00008f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F84 2944 bytes
SHA-256: fcfcd28869b8d6c7503d63ed8d48371ec5b580fea2733193e2acbb82b3d30a76
font_02_sfnt_off000099aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99AA 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6BC 19328 bytes
SHA-256: 2bb545c14ce80967bc964a539ce1fba7d75b9199f0e299556cda79647f99e488

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