Malicious PDF — malware analysis report

Static analysis result for SHA-256 5904de5969151620…

MALICIOUS

PDF

47.6 KB Created: 2021-06-09 08:57:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2b5e64f3f2a0af6a024a4cab54bee432 SHA-1: 3995c20b6165bbd5196730ceb61408babc02b186 SHA-256: 5904de5969151620007d14b03dbccc95cc274599e626ccb6d91dbeb872cafdf9
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document displays a fake CAPTCHA and impersonates Amazon to trick users into clicking a malicious link. The embedded URL, https://netcdn.tw/app/431946152/how-to-get-any-aduio-for-free-roblox-game-hack, likely leads to a credential phishing page or a download of further malicious content. No scripts were extracted, but the document structure and heuristics strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/how-to-get-any-aduio-for-free-roblox-game-hack.
  • 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/how-to-get-any-aduio-for-free-roblox-game-hack PDF link annotation
    • http://www.fluidtech.hu/images/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/prisonbreak16-hack-script-roblox_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/roblox-robux-hack-no-survey-android_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/robux-today_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/tiktok-free-iphone_GM835599320.pdfIn PDF document text
    • http://www.fluidtech.hu/images/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/minecraft-pe-mod-menu_GM479516143.pdfIn PDF document text
    • http://www.fluidtech.hu/images/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/coin-master-hack-android-root_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/minecraft-net-free_GM479516143.pdfIn PDF document text
    • http://www.fluidtech.hu/images/2021-roblox_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/games-you-can-hack-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/procodes-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.roblox.comIn 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_004_off0000515d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x515D 25152 bytes
SHA-256: e4c0de24563eb28b838c464cf06d13fd2f42ee45c7f5e2bc12d743240d477419
font_01_sfnt_off00008bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBD 2828 bytes
SHA-256: db1860fd79a3f2cbe32e2bada3ba4c68a2d581b7a24294387cd777233cc9cef6
font_02_sfnt_off00009573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9573 18828 bytes
SHA-256: 26287c42b26293a86f7045e171a9fb21a7fbb00178983e00bfddf950899a917e

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