Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5df31d511aa2083…

MALICIOUS

PDF

39.7 KB Created: 2020-10-05 12:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 6dd5da82a0c5ae714fe01674e378589d SHA-1: 7ccf03b7ef8af18b4cccfcf5783f63221a378640 SHA-256: d5df31d511aa2083976460c1aa79cc6c740c4fac29e03ced7fc5c80599b0f4f0
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=capillary+action+experiment+worksheets In PDF document text
    • http://files.cedargrovewindyhillfarm.com/uploads/1/3/0/8/130874110/zoven-xegaxejojidew-mabotuxon.pdfIn PDF document text
    • http://bilebap.ofshawaii.com/uploads/1/3/2/8/132814930/217c9d.pdfIn PDF document text
    • http://bitesew.dukeswear.com/uploads/1/3/1/4/131437508/8203937.pdfIn PDF document text
    • http://wixuj.billboudreau.com/uploads/1/3/1/0/131070045/3799180.pdfIn PDF document text
    • http://files.homeacademy.sanctafamilia.org/uploads/1/3/2/6/132682704/3641400.pdfIn PDF document text
    • http://bidobuxus.peterandpaulapixie.com/uploads/1/3/1/4/131454215/kuduj-lumataw-wenuxewud-bofixev.pdfIn PDF document text
    • http://dovur.roomtowritebristol.com/uploads/1/3/1/3/131398285/04859.pdfIn PDF document text
    • http://files.ucdllp.com/uploads/1/3/2/7/132741555/7093063.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/1/0436/1630/5312/files/closed_toe_sandals_with_arch_support.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2126/0184/files/32905257903.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/5645/9676/files/honors_biology_genetics_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9703/4393/files/jordan_candy_store_covid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8786/3715/files/lajubunuli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5207/2612/files/yorkie_puppies_for_sale_in_kentucky.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3069/1496/files/4016930890.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_off00005d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D4D 5404 bytes
SHA-256: 5b8456c22808b57e5f5060dae25288a4c22232a6b1e0a762e10504a096676be2
font_01_sfnt_off00006f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9C 10032 bytes
SHA-256: e00e0b16104c1f571723d0d906cc90d3b1dc2b903840d18bc17d393071d3d62e

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