Malicious PDF — malware analysis report

Static analysis result for SHA-256 507d40d813cef928…

MALICIOUS

PDF

36.2 KB Created: 2020-10-30 04:35:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: ac775ce8619ac7ac4a28304379d398cd SHA-1: 9bf56c1b5f400bbaab3d33dc0749af431fbb897c SHA-256: 507d40d813cef9287d1c5deae0f95142c39f2e82a55f5fd53b125bd266784b57
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/strik?keyword=alberta+outdoorsmen+magazine In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371809/normal_5f96b8f7ab6af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417814/normal_5f9a35d158f91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8507/9739/files/terofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c2baffa-33e5-4f05-9115-c928821f3347/95129171064.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5400/5911/files/71117263444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fa4be44-8d65-4813-9239-77fd961a2287/bobezuvudinezewor.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/fiwanexipilusemur.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/coronary_angiography_procedure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1711/8111/files/peachtree_accounting_exam_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fde00bc5-f11f-4a21-a1e7-4591ec537dc1/caracteristicas_de_una_columna_de_opinion.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 PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D21 5324 bytes
SHA-256: d735781620456c7df48239f84c8bd16077a7b035d4b079efcf39ebb3509284fc
font_01_sfnt_off00005f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F23 11020 bytes
SHA-256: ec0e29ef32f3e59d19e78c01067d2d85feb449041fe7cab836c0ca2c3ce95fb7