Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5877d393608734…

MALICIOUS

PDF

42.1 KB Created: 2020-11-04 20:50:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 7edcf7bebfc3ffe2f5f94d45215f6f18 SHA-1: 9bb913f27818d271e49f2fc7080f6dc1bbb965e6 SHA-256: 8c5877d393608734b62d1c56848c9746912763107cfd75451d15077e342b0e4b
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://cctraff.ru/aws?keyword=minecraft+sp+viper+squad+download In PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/larano-gugutimed-vumibokat-defigibaga.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006570.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006570.bin)
    • https://uploads.strikinglycdn.com/files/f635b51b-dca5-4687-84c3-dd8fe33ca37d/nikkormat_ftn_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aac5d4b0-e154-4c16-8088-4686b181d76f/vygotsky_constructivist_learning_the.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/studietrust_bursary_application_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4881/0688/files/period_8_apush_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77f6a88-05de-43d9-b52d-efd978941334/juwamigeru.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/zedogal.pdfIn PDF document text
    • https://s3.amazonaws.com/naramuro/flight_radar_24_pro_apk_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4231e1b-5147-4795-879d-b12fb6cb2321/89218234805.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/41835126965.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/vefapiluxepopasetilijuk.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/xowodoxajebolexo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn extracted file (font_00_sfnt_off00006570.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6570 5432 bytes
SHA-256: a78fd13461b5ff481fa6ff2198d0dd163aa7c01e3d5a8231bc3422f565b34971
font_01_sfnt_off0000781c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x781C 10500 bytes
SHA-256: ecb8abffbba31b4c1d2962e6f3040642dd75f9db28e48972d7799993c81965ad