Malicious PDF — malware analysis report

Static analysis result for SHA-256 35be4a8bfb9acf9c…

MALICIOUS

PDF

69.8 KB Created: 2020-10-15 11:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: e68e41d0502b0d72ba3148993380945d SHA-1: 7f96e941e5d11095f0993b50d2dcb615e53de700 SHA-256: 35be4a8bfb9acf9cd2fc14ed47bbf8c159e6f17c94947af4d90d1aa2bb8107dc
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=trucicielka+kr%25C3%25B3lowej+pdf+chomikuj In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f86f8b1da02b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f873decb3e2b.pdfIn PDF document text
    • https://site-1036734.mozfiles.com/files/1036734/jebitudej.pdfIn PDF document text
    • https://site-1036873.mozfiles.com/files/1036873/42879809998.pdfIn PDF document text
    • https://site-1041777.mozfiles.com/files/1041777/livolujiwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f87e43cd4c3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f876df64dc15.pdfIn PDF document text
    • https://site-1042768.mozfiles.com/files/1042768/fulaxitojesob.pdfIn PDF document text
    • https://site-1042492.mozfiles.com/files/1042492/3788801091.pdfIn PDF document text
    • https://site-1042968.mozfiles.com/files/1042968/pemamimalozuradilojufexu.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/1/0499/4698/4616/files/sawigorukadaminopofipok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5802/6901/files/cosmic_ray_pathfinder.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/0558/9920/files/scholarship_2019_to_2020_status.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1156/1399/files/63646071324.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7619/0361/files/zetijeranaxup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a50bddee-f803-419b-8f91-015d40986603/gejinitaloxizitoziva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5355cf3c-94e0-4a4a-927f-ec5c05db3f9e/68846955877.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_off0000cfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD8 5532 bytes
SHA-256: 0e5709cfe0e319e9bd76a6e716913dfc20cefe44415768987926c478473c885d
font_01_sfnt_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 12000 bytes
SHA-256: 5c80ba9b0b5a5747e3ae19ab4305c9cec3e9b868f2a02575d427be71d9301c4f

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