Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e9dfa5ac0c8d3a…

MALICIOUS

PDF

48.7 KB Created: 2020-10-01 14:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b8222afd5b871a972561b2a3cf0ab78b SHA-1: 71af1bb243f836ca1188c13d0ca20c35d59a0bd5 SHA-256: d0e9dfa5ac0c8d3a7e92b28217f79359ac854648206fd134f47ed1afffda1737
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/strik?keyword=topological+data+analysis+book+pdf In PDF document text
    • http://raranew.jesswebbart.com/uploads/1/3/0/7/130739416/9083506.pdfIn PDF document text
    • http://files.stmarktoledo.com/uploads/1/3/0/9/130969505/7d153456b25.pdfIn PDF document text
    • http://samut.weldcountymeatgoats.com/uploads/1/3/0/9/130969868/lipesidatem.pdfIn PDF document text
    • http://goleji.annawitte.org/uploads/1/3/0/7/130776367/48aa61.pdfIn PDF document text
    • http://files.cafente.com/uploads/1/3/0/7/130739389/4240085.pdfIn PDF document text
    • http://ritudi.icspres.org/uploads/1/3/2/6/132681393/8584183.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/04102281-7f3d-44db-8006-92060ce92bf6/govulebenu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7179/0494/files/netbeans_full_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5030/6198/files/52795786552.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/tekoraxapofirajuxexi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/9432/8742/files/vunisopepo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000722f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x722F 5152 bytes
SHA-256: fb1e45ecebda6bfd8839a0fc6233bb9361932821f29d32f7f9261e4d8e753b30
font_01_sfnt_off000083c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83C5 10492 bytes
SHA-256: ac8f46a97f5599846b6bf4afb681628ed6ffff91173d87ab2579835cddba3c62
font_02_sfnt_off0000a78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA78C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e