Malicious PDF — malware analysis report

Static analysis result for SHA-256 b386256d00e5ef79…

MALICIOUS

PDF

37.8 KB Created: 2020-10-01 06:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 836a4dfb99a8c6a645aa3a5578abb042 SHA-1: 1d6347a00c85b89893f87128ddc18bdbe92ca1a6 SHA-256: b386256d00e5ef797aa8592107c3ebebfc122051a5fce8d3d24198b4af638462
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://ggtraff.ru/strik?keyword=complete+spanish+grammar+pdf In PDF document text
    • https://site-1037268.mozfiles.com/files/1037268/71431428947.pdfIn PDF document text
    • https://site-1038401.mozfiles.com/files/1038401/nejitakubik.pdfIn PDF document text
    • https://site-1036719.mozfiles.com/files/1036719/sekufepapezalixaxokupo.pdfIn PDF document text
    • https://site-1036987.mozfiles.com/files/1036987/18846087099.pdfIn PDF document text
    • https://site-1039892.mozfiles.com/files/1039892/rulejagetuxetopanel.pdfIn PDF document text
    • http://fuziguna.augustinepotter.com/uploads/1/3/1/4/131405927/cff6f1a6f4.pdfIn PDF document text
    • http://files.amandaxelas.com/uploads/1/3/0/7/130775584/jegulupebux-wofoxorebog-wodifapumeseme.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/1/0433/0687/7080/files/94430640368.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0711/3373/files/facebook_messenger_for_nokia_216.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9212/2527/files/vetaxasejexo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0686/8126/files/9657784367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d33d41b9-e4c9-4df4-a835-5ccf557843f4/2022770610.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_off00005705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5705 5360 bytes
SHA-256: 045e608cdf29e81869c2c92ef3e933eed315bc57fb5a070fd693c0a1d0a28d6b
font_01_sfnt_off0000690b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x690B 9868 bytes
SHA-256: 94e9c0c28da6a0546779663099e4e7ce5813a0df3d637e0480b0390d6b32ae48