Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5b3056a760b281…

MALICIOUS

PDF

46.5 KB Created: 2021-06-03 05:21:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f66f731df50f520c4cca8e8a609c69dc SHA-1: ca5b70ee6d947e5fe917638f081f53091c8ac91d SHA-256: cd5b3056a760b281eafc7014ebecb3a17cc4b448c1fe7d1486a44cbfeef3bbd6
102 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick the user into interacting with malicious links. The embedded URLs, such as 'https://netcdn.online/app/406889139/coin-master-free-spins-link-2021-blogger-game-hack', likely lead to the download of a second-stage payload or phishing content. The presence of multiple PDF-related heuristics and the ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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
  • 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 https://netcdn.online/app/406889139/coin-master-free-spins-link-2021-blogger-game-hack
    • https://cleansui.com.tw/image/data/files/best-free-minecraft-hacked-client_GM479516143.pdf
    • http://cleansui.com.tw/image/data/files/minecraft-toys-for-free_GM479516143.pdf
    • https://cleansui.com.tw/image/data/files/coin-master-spin-hack_GM406889139.pdf
    • https://cleansui.com.tw/image/data/files/robuxmatchcom-free-robux_GM431946152.pdf
    • http://cleansui.com.tw/image/data/files/free-coin-master-link-2021_GM406889139.pdf
    • http://cleansui.com.tw/image/data/files/fake-gps-pokemon-go-free_GM1094591345.pdf
    • https://cleansui.com.tw/image/data/files/coin-master-hack-without-verification-2021_GM406889139.pdf
    • http://cleansui.com.tw/image/data/files/no-verification-coin-master-hack_GM406889139.pdf
    • https://cleansui.com.tw/image/data/files/ways-to-get-free-robux_GM431946152.pdf
    • https://cleansui.com.tw/image/data/files/coin-monster_GM406889139.pdf
    • https://cleansui.com.tw/image/data/files/coin-master-games-download-free_GM406889139.pdf
    • http://cleansui.com.tw/image/data/files/free-spins-coin-master-april-2021_GM406889139.pdf
    • http://cleansui.com.tw/image/data/files/http-bitly-coin-master-free-2021-spins_GM406889139.pdf
    • http://cleansui.com.tw/image/data/files/free-robux-giveaway_GM431946152.pdf
    • http://cleansui.com.tw/image/data/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://cleansui.com.tw/image/data/files/how-to-free-robux_GM431946152.pdf
    • https://cleansui.com.tw/image/data/files/free-robux-app_GM431946152.pdf
    • https://cleansui.com.tw/image/data/files/how-to-get-robux_GM431946152.pdf
    • http://cleansui.com.tw/image/data/files/minecraft-rtx-download-free_GM479516143.pdf
    • https://cleansui.com.tw/image/data/files/mcpe-116_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000540f.bin
e759bbee7d2674df318e6eedb384424f7a07a160aa37937c74b3f4ed9e940165		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x540F 29160 bytes
font_01_sfnt_off00009102.bin
6906a9989d8784d6f8a9776352e09c335330dbd77f725755b0e4967acb3193dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9102 19036 bytes

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