Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e77828e8af0377…

MALICIOUS

PDF

35.3 KB Created: 2021-06-25 14:00:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 566fa592611969f9d431970cd78c8e21 SHA-1: 7a3bf44a0521b73259b4cca749f75c9b3ef3c6fd SHA-256: 18e77828e8af037767672821fda2534660c07535eb33119998dc1d2f5636f55c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized pages promising free Robux or Coin Master spins. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, and the ML classifier strongly flagged this PDF as malicious. The presence of a 'download button' lure further supports a malicious intent to redirect users to potentially harmful sites.

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/este-pagina-hack-te-regala-muchos-robux-en-roblox-funcionando-game-hack PDF link annotation
    • http://pustaka.ust.ac.id/repository/free-robux-games-on-the-front-page_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/do-you-want-free-robux-get-unlimited-robux-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-just-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-install-wearedevs-hack-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-blue-hair-com_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-bloxburg-free-bs_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-hack-roblox-2021-april-may-new_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/hack-confiteration-data-base-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-hack-roblox-model-not-for-sell_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/que-hacer-cuando-te-hackean-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-free-no-survey_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/christophsis-roblox-free_GM431946152.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_off00003104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3104 22360 bytes
SHA-256: faf52ce4c37c015be27b214c16d82c1970fa5e804a83100b54e455852868dcba
font_01_sfnt_off000062d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D1 19876 bytes
SHA-256: ca5e16a4422b464e930f5e2b1d0da48965dda8f56df1b5d43216e31bc47de8da

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