Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdb43d460fec076…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 18:22:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: adf446505ac614938b54633f4bed6bf2 SHA-1: 3529918df73f92059400a621128cf018b0773524 SHA-256: ccdb43d460fec076c2768ad39f585a47b86d2189d42d1f60536a0bdc90577c33
82 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 clicking a link. This link, 'https://netcdn.online/app/406889139/free-spin-link-coin-master-today-game-hack', likely leads to a second-stage download or exploit. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/406889139/free-spin-link-coin-master-today-game-hack PDF link annotation
    • https://www.wcauk.org/uploads/files/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/pokemon-go-free-legendary_GM1094591345.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/robux-premium_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/mcpe-com_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-spin-and-win-coin-master_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/roblox-hack-generator_GM431946152.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fc7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FC7 24392 bytes
SHA-256: ee351ada0ba764bf6c2b612d4923096dfe9761cc90e1e221d9e8c87c8db3e866
font_01_sfnt_off000087d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D3 18412 bytes
SHA-256: e587088874bde045b6c3de0610cebf0d89afe726cd39a539bf85554ca93a9bfa

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