Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b5955dbdccd82c…

MALICIOUS

PDF

36.1 KB Created: 2021-07-04 11:52:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3bf346c7b8aed8f9922258cd46c8ef7c SHA-1: 367931ca82100a73e4d583c7b6867243abde0508 SHA-256: c4b5955dbdccd82cb9aca98cc3520d5dd4a7d600a51ecdf6afeaa487fc57e195
102 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are designed to appear as legitimate resources for obtaining free Robux or other in-game items. The presence of a "PDF_SEO_LINK_FARM" heuristic firing indicates a large number of these links, suggesting a coordinated effort to direct users to potentially malicious download sites or phishing pages. The ML classifier also strongly flagged this PDF as malicious.

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.tw/app/431946152/free-robux-hack-no-verification-game-hack PDF link annotation
    • https://pasca.unisba.ac.id/elibrary/repository/how-to-hack-roblox-accounts-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-to-get-a-free-home-on-roblox-on-rocitixens_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/appcatch-free-robux_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-tiktok-likes-and-followers_GM835599320.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-quick-and-easy-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-come_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/earn-free-robux-zone_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-youtube-live_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/hack-roblox-weight-lifting-simulator-3_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/pubg-for-uc-free_GM1330123889.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-rocitizens-cheats-2021_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-assassin-how-to-get-free-exotic_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/all-twitter-cheat-codes-mad-city-roblox_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_off00003410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3410 22968 bytes
SHA-256: 06629895ea51aae63b4cde50070f888ec1fd3bdeeb33b902ef66e588bde4a965
font_01_sfnt_off00006799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6799 19244 bytes
SHA-256: 96540bd7c84d60e769713d590412c745bf113fce47b0f54684cca50d2dde6ca8

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