Malicious PDF — malware analysis report

Static analysis result for SHA-256 949d5d8762120e72…

MALICIOUS

PDF

42.0 KB Created: 2021-05-13 09:33:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8f5ffc10e56121c55b22668e5bacf3b2 SHA-1: e5c690231271c870a4c11fe195ee40d14891a5a4 SHA-256: 949d5d8762120e7243a037a0de24d3d083310e8154ff2023dd26f409575256d0
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to SEO-optimized PDF files related to games and free currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm or a distribution mechanism for potentially malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/479516143/free-minecraft-server-game-hack PDF link annotation
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-reward-link-2021_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-hacks-android_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-today_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D71 24192 bytes
SHA-256: 5131a60620fff08fff29a06bf2a31916609229e600784fe77b418424477b9310
font_01_sfnt_off00008382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8382 17684 bytes
SHA-256: 971ebce79d03a5424fa8491ae570b1f65fe2ad06e00737069ab54be99501e2e8

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