Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa6d1bfdacbab97…

MALICIOUS

PDF

36.2 KB Created: 2021-07-01 08:45:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 67a424a093feb21af902e1d9518a2585 SHA-1: 87877e45211733307c6d1da4dc844c46c6fd0fb5 SHA-256: 8aa6d1bfdacbab974ca7199c2ab57c60c87de7a3230f8251c39795f072b2ad75
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains numerous embedded URLs and a link farm, suggesting an attempt to redirect users to external sites for downloading content. The ML classifier and PDF SEO link farm heuristic strongly indicate malicious intent, likely to distribute malware or facilitate scams. The presence of download-related lures further supports this conclusion.

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-promo-codes-roblox-june-2021-game-hack PDF link annotation
    • https://pustaka.widyakartika.ac.id/repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-hack-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-hack-for-robux-kredi_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-mod-apk-download_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/www-free-robux-hack-generator-club_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/static-moonactive_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-no-human-verification-2021-ipad_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-legit-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/hacks-para-el-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-mobile-hacks-4-free-com_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-lets-play-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-premium-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_off000034dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34DC 22268 bytes
SHA-256: 92a3ef47ed7e52c9d43f9efe19859341371a4adf7f7998a0d16d4523fa1ec33b
font_01_sfnt_off00006617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6617 19948 bytes
SHA-256: 6f4bb0663869202ac8e55f505484c87de25d31469b6847a1d3df707423f6ed30

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