Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52c7ea4c53663b3…

MALICIOUS

PDF

49.8 KB Created: 2021-06-08 23:26:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a09d879885be549e4de7bdd0f8cc0596 SHA-1: d6f741d522e7424646568da86d9566c3353cec28 SHA-256: d52c7ea4c53663b3ae086ede5138ef41ad7f410b9075f32ab8e4d724a9da6672
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 interacting with malicious links. The embedded URLs, such as 'https://netcdn.tw/app/431946152/denis-free-robux-website-game-hack', likely lead to the download of a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/denis-free-robux-website-game-hack PDF link annotation
    • https://sensorcamera-tw.com/upload/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-bobux_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/get-me-robux_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/roblox-hacked-accounts-list_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/coin-master-daily-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/coin-master-games-download-free_GM406889139.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000555c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x555C 26436 bytes
SHA-256: 7f71df15f2ee63fe9c184a93379371973990c85b348cc085efa6d341d264977f
font_01_sfnt_off00009244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9244 3656 bytes
SHA-256: 63a179d8a9645bea05c6d53b1776faf4e4a7281930de6cf484e639846bec2e20
font_02_sfnt_off00009efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EFD 18604 bytes
SHA-256: 92b1aee1056da9e965c4d971d7e334d667755a4eb64013f2faca961fbbf9ded8

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