Malicious PDF — malware analysis report

Static analysis result for SHA-256 cebee42d69c641dc…

MALICIOUS

PDF

42.3 KB Created: 2021-05-16 00:03:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e92e602ccffb0400797c2acdf270f1bc SHA-1: 6d64162418026bdb836e3d426f5b3f77f82adac5 SHA-256: cebee42d69c641dc742cb8db1ab41c2d0999ca0e4f18de06e16d3a664a3efc2e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document presents a fake CAPTCHA to trick the user into interacting with it, likely to initiate a download or redirect to a malicious site. The embedded URL points to a resource related to 'free robux', a common lure for scams. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to exploit user interaction, potentially leading to the execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/can-you-give-me-free-robux-game-hack PDF link annotation
    • http://gornjastubica.hr/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/daily-free-spins_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/coin-master-ios-gods-hack_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/www-robux-com_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/best-hacked-client_GM479516143.pdfIn PDF document text
    • http://gornjastubica.hr/files/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-roblox-hack-us_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_003_off00004a2d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A2D 24164 bytes
SHA-256: fdee4cfca36603cf7d067888cd5eb07750931711e0adb91f51f0c18c3543d790
font_01_sfnt_off00008172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8172 18836 bytes
SHA-256: f7ef8038c45e68508aae9bb0b63a3af28c92eee5ac21090050d85675c825651a

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