Malicious PDF — malware analysis report

Static analysis result for SHA-256 779615b5c3d84eab…

MALICIOUS

PDF

46.8 KB Created: 2021-06-10 19:27:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2b3c03ccb1718da683f1ad078d379a6d SHA-1: 6e70a95af81d81d49ef995b3edfe905d6f643216 SHA-256: 779615b5c3d84eabc257be751802ee85685ecc394e64f158bccb11672c04cd1c
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document impersonates Microsoft and presents a fake CAPTCHA to lure the user into clicking a link. This link, 'https://netcdn.tw/app/431946152/roblox-cheat-phantom-forces-game-hack', leads to a site offering game cheats, indicating a credential phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious intent to redirect users to potentially harmful content.

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
  • 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/roblox-cheat-phantom-forces-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/roblox-cheat-phantom-forces-game-hack PDF link annotation
    • https://vierabyragazze.com/upload/files/coin-master-apk_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/best-hack-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-link-for-spins_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/robloxs-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/login-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-minecraft-java-server_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052a0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52A0 29628 bytes
SHA-256: 483a5cd94a35cbcb14c0a789a53e10c57f5f6c11ef4be49484a11c954342bd95
font_01_sfnt_off00009300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9300 18860 bytes
SHA-256: 4c0c5b88cd145cab59d0d26b5d71e3daf87c3e77575cfec8879a0d79f77660df

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