Malicious PDF — malware analysis report

Static analysis result for SHA-256 98daabf17ecf0af3…

MALICIOUS

PDF

34.8 KB Created: 2021-06-25 05:04:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 13f75cfa79239bc44b73ddee1082d44e SHA-1: c937a6fb5a64b0701e78e6ba6f176b5e8e1c6d22 SHA-256: 98daabf17ecf0af3cd60c54da8aecbcd3703216a1cdfcd3a3b6e40a8db5852aa
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains numerous links disguised as game hacks and free currency offers, a common lure for users. The presence of a fake CAPTCHA heuristic indicates an attempt to trick users into executing further actions, likely leading to the download of a second-stage payload. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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
  • 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/adopt-me-hacks-in-roblox-game-hack PDF link annotation
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/yt-how-download-script-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/boku-no-roblox-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-days-dino-sim-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-model-games-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/robux-online_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-robux-giver-hack-download_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/comment-installer-un-cheat-sur-roblox-bulble-gum_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-followers-on-tiktok-no-verification_GM835599320.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-jojo-project-cheat_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-ios-2021_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-pastebin-javascript_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_off00003075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3075 22316 bytes
SHA-256: 25606158cd1dc4d3c22c928d76af8f4f5a853a45b6e203cab1409018bad1ce11
font_01_sfnt_off00006230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6230 19308 bytes
SHA-256: dc70027b39133138b01fddc5b933c962b98852f01d6fc9e4b14116f9321a0627

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