Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf20c8aad9373fb…

MALICIOUS

PDF

35.1 KB Created: 2021-06-25 21:59:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9b45d5e43efcf0d25e1f6f4f95a016d6 SHA-1: bf8d40f10ebcf15a94b92ebfcd111dec88d79342 SHA-256: cbf20c8aad9373fb51db35593a8345bd13dc152b51e0f26ebd9faaf07b589def
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The ML classifier strongly indicates maliciousness, and the document body contains numerous URLs related to game cheats and hacks, such as 'sentinel-hack-roblox-game-hack'. This suggests the PDF is designed to trick users into downloading malware disguised as cheats or in-game currency generators. The presence of embedded URLs and the 'ML_NYX_PDF_MALICIOUS' heuristic firing support this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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 http://netcdn.co/app/431946152/sentinel-hack-roblox-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-catalog-items-roblox-2021-december_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/www-coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/cruise-ship-tycoon-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-ios-cheats_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-spin-card-exchange-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/strucid-aimbot_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/proxy-site-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
font_00_sfnt_off00003149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3149 22840 bytes
SHA-256: 4c71f2961cb96d0daea5a3626e3d5f423c122026c0c70e4ac2349cf0b1616d30
font_01_sfnt_off000064a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A4 18880 bytes
SHA-256: 3f1b0d0e937a0f187ccecfd33e95a49472a1f236def32c5ee7eba81c3814dbf5

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