Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b177fbf51d0845…

MALICIOUS

PDF

33.9 KB Created: 2021-06-28 03:16:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a8ac7af74df2abf8493862725639cbc6 SHA-1: 9a9118192e8325df33d1a1f18106d120b6e2f3b3 SHA-256: 22b177fbf51d084518b30c79d87432e2bdfeefbb30bb702203a6b0c25ac2282f
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm or content-loading mechanism. The ML classifier and PDF heuristics strongly indicate malicious intent, likely to trick users into downloading malware or visiting malicious sites under the guise of game hacks. No scripts were extracted, but the presence of many external links and the ML detection point to a downloader or exploit delivery.

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/wrd-hack-roblox-game-hack PDF link annotation
    • http://library.fk.upnvj.ac.id/repository/free-clothes-that-are-good-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-hack-in-roblox-jailbreak-2021-mobile_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/tips-and-hints-to-get-robux-for-free-hack_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-pets-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-spins-ios-2021_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/robux-genorater-no-human-varification-no-survey-no-hack_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-roblox-accounts-november-2021_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-hack-csgo_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/hack-in-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/haktuts-coin-master-today_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-robux-for-free-2021-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-setup-a-minecraft-server-for-free_GM479516143.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_off00002e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E91 22024 bytes
SHA-256: 0e5ed2981a0b961e7f324fcb45a0580c2b5491712598c1fd2a9c0f404d7a4194
font_01_sfnt_off00005f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F59 19028 bytes
SHA-256: 4b729e2521e2ce8eb2d442f3b4fc02618f5e439214befc72942e79b71adad6ca

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