Malicious PDF — malware analysis report

Static analysis result for SHA-256 b774c73e463611e2…

MALICIOUS

PDF

34.8 KB Created: 2021-06-29 20:43:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b0ec59da276246685a1a9236c370a57c SHA-1: 6cdeebeee594e6cf6215fdf3ed461469269b8d6d SHA-256: b774c73e463611e2434dfa1ae20901c57cd72eb6ef3ff7fdca82e566a67815df
142 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are presented as guides for popular games like Roblox and Coin Master. This suggests a link farm or phishing attempt designed to trick users into clicking malicious URLs. The presence of a 'Password-protected archive handoff' heuristic further indicates that the linked content may be an encrypted payload, intended to bypass initial security scans.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/how-to-you-hack-on-roblox-assassin-2021-game-hack PDF link annotation
    • http://library.fk.upnvj.ac.id/repository/roblox-free-printables_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/hack-roblox-wipeout_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-hack-any-roblox-account-2021-easy_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-free-catalog-items-pastebin_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-servers-that-give-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-cards-free-cards_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/cheat-codes-roblox-reason-to-die-101_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/giving-away-free-toy-codes-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-prevent-your-roblox-account-from-being-hacked_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-hack-into-your-roblox-account-without-the-password_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/letra-de-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-coins_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-groups-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/como-recuperar-tu-cuenta-de-roblox-hackeada_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_off0000323a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x323A 21392 bytes
SHA-256: 3079bed176558b67cec7da31bff7dc2883077ff9022922ddd80728115e4f4105
font_01_sfnt_off00006113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6113 19644 bytes
SHA-256: 0f7a8bef60af75097a487d0adc3baf61d6a52159abd68253816bb495e9a5e086

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