Malicious PDF — malware analysis report

Static analysis result for SHA-256 8415d58dfc61d5bd…

MALICIOUS

PDF

41.7 KB Created: 2020-10-17 10:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: acf6ef773533c6630ccc2e12f8337191 SHA-1: d8efa15aee23804683e231e4e343fa373da42601 SHA-256: 8415d58dfc61d5bd8fd7883b7c6d3a387e1e3372d44916aa8cc33789770b89ab
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/123?keyword=exercices+sur+le+discours+rapport%25C3%25A9+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_5f872d81f3abc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f872a39a1ff7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f88fd2230ded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_5f8a9cfdc258b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f8a478524498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_5f8a16cb933d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f889da678323.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/pugimus.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/9d013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5f88450b84f3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f873e86c750a.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/1/0434/7658/2560/files/good_afternoon_quotes_in_spanish.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6793/2317/files/revatu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/9688/2334/files/91308677832.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1612/6625/files/death_note_l_death_episode.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3766/2613/files/california_realtor_lease_agreement.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_off00005f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F16 5316 bytes
SHA-256: 928029c4e97ae318673014fdd1223fd18a3898805cf5d5ae631a624db1c5b302
font_01_sfnt_off000070fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70FB 12088 bytes
SHA-256: a5b1bedc9cc506b5366463d256365ec72227956c9d72cc22c9fdc083fde4376d

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