Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc7a95a8ea9ccd1…

MALICIOUS

PDF

36.1 KB Created: 2021-06-18 02:12:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 117b858121d2493843872ad6e9f0a174 SHA-1: 1b4a3b66f79bbf1cdbafc61e9eed72a61ce1d620 SHA-256: cdc7a95a8ea9ccd14d13c41427770f059e6305b828e4bbe10f0a5ee5b011b8dc
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that explicitly advertises a 'Free Robux Generator' and related game hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which are SEO-optimized PDF links, suggesting a tactic to drive traffic to malicious or scam websites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to deceive users into clicking links that lead to unwanted downloads or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/free-robux-generator-no-survey-no-download-no-human-verification-game-hack PDF link annotation
    • https://fib.ub.ac.id/sac//repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/need-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-no-waiting-pastebin_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/40-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/web-cheats-xyz-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-coins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-pc-free_GM406889139.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_off00003453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3453 21912 bytes
SHA-256: 7d5268f59a9dc98c51afacbcefee9c11f661dfb53a62dc040b5f604de9c9265e
font_01_sfnt_off000064ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64BA 20208 bytes
SHA-256: 0ef666815fca28e6c6cf3435968b0c81522e44f0a8d83e831ed265583d1f0e29

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