Malicious PDF — malware analysis report

Static analysis result for SHA-256 7635b9c71e3f436e…

MALICIOUS

PDF

35.8 KB Created: 2020-10-04 07:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: fdeecbb74c194a3390c65485ca1371e4 SHA-1: ab4f8efc90091e87d1585f9c160f478787b90b9b SHA-256: 7635b9c71e3f436ec506b413681380a241d4a665a34b37d1100c7f9d03d2989b
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=blundell+and+blundell+pdf In PDF document text
    • http://kegiv.aera19.net/uploads/1/3/0/7/130738970/4334533.pdfIn PDF document text
    • http://boxalof.jessicaesalvatore.com/uploads/1/3/2/8/132814930/568051.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/1/0430/5335/1066/files/17978118101.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6706/7554/files/manganas_a_pie_el_ahorcado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9033/2836/files/arabic_pronouns_chart_with_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8893/5067/files/39793991315.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4783/6065/files/jovobabasexajaziweweban.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1851/7152/files/compound_probability_worksheet_6_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4096/3751/files/conflicts_in_the_yellow_wallpaper.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_off00004ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EE9 4952 bytes
SHA-256: 939bba6434ec1668aea069d36a2910244a03b7465255ec6dc07411bc948997a1
font_01_sfnt_off00005fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD0 10240 bytes
SHA-256: aff1448092d52c8aabd9ae52d4c37dc6f8702c49d213e746ee93f97ba45aca5d