Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff65cf283893e26…

MALICIOUS

PDF

45.7 KB Created: 2021-05-13 17:47:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3c58485e8691e9dfc151c8d1335f3c50 SHA-1: cb0735a8b7ee493bfacb77384ed23abacee151ef SHA-256: eff65cf283893e2624e2c71aca4ffeb93f8d8e61031e4f9feddb42a96a5705f6
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/www.coin-master-free-spin.com-game-hack PDF link annotation
    • http://cleansui.com.tw/image/data/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/blox-fun-info_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-mster-free_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-free-spins-apk-2021_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/roblox-free-clothes-girl_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/roblox-inappropriate_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/robux-premium_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-34-5-hack_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b2f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B2F 24616 bytes
SHA-256: 7b15860ff990857a53f1deedb3505ff1c44eb0b2669a8a9f30a1ce61b6ebf8d5
font_01_sfnt_off00008384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8384 3380 bytes
SHA-256: 1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57
font_02_sfnt_off00008f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6D 18572 bytes
SHA-256: ed0f46b45175b3a0c483ea36cdefccaabd5a623488b2c81547443f1c8be55e43

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