Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfc4d4a3141f64f…

MALICIOUS

PDF

58.7 KB Created: 2020-10-04 00:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 2661fe25f60c1911947e1c691ccc5952 SHA-1: eae5637b09666c42021aa5edb41042a95397e776 SHA-256: bdfc4d4a3141f64fb0edea72f99e7e30e5ecfb56ba2365588003bf940c57c631
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=african+american+slang+dictionary+pdf In PDF document text
    • https://site-1038864.mozfiles.com/files/1038864/mimoralarobozinu.pdfIn PDF document text
    • https://site-1036907.mozfiles.com/files/1036907/jegevumafaka.pdfIn PDF document text
    • https://site-1036679.mozfiles.com/files/1036679/60156586225.pdfIn PDF document text
    • https://site-1036851.mozfiles.com/files/1036851/pagawatokivimegus.pdfIn PDF document text
    • http://xasapen.saintsprotect.com/uploads/1/3/1/4/131455508/f6fd4a01b7a8dc.pdfIn PDF document text
    • http://files.reformation.kaisons.org/uploads/1/3/1/4/131453897/4041267.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/1/0457/3668/9820/files/dykes_to_watch_out_for.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2629/0587/files/juzowe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8976/2206/files/zefogusagozurorixajanogo.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_off0000a70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA70E 5564 bytes
SHA-256: 8d9606a4befd502b0939090d2e0cbc75accd66b43d398e2ea24fe3bafe9b7179
font_01_sfnt_off0000b9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F2 10636 bytes
SHA-256: e0a36ccaa5f600df2f18131720fbf507bab40ca06cf311a1e618cbbced414a38