Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de79743d013d3ee…

MALICIOUS

PDF

45.1 KB Created: 2020-10-17 01:39:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: bb7d7c3eddfcae63de6b13408844a86e SHA-1: 61267aaf69d6f50eb6fad9afdffb0c34c244d5af SHA-256: 4de79743d013d3ee068eb29199f28380b55752bf17d940e0826959237e5e2ad7
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://ttraff.ru/123?keyword=inline+skate+wheels+buying+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5f8a0eda60a9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f874b886ffa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5f89da1fd311a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377095/normal_5f89c5b7b758e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_5f8a16ee64f41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f88bcf8a4e98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371508/normal_5f8a0f7fc47a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5f89544796f72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_5f89f89283e16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5f881a95ab875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374364/normal_5f88fbc67c122.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/gajiwegevogepe.pdfIn PDF document text
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/9887211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f87597051c1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5f878cb37d475.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/1/0432/1918/9915/files/64547507987.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6033/8594/files/43681337253.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5555/3443/files/can_do_descriptors.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_off00007400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7400 5328 bytes
SHA-256: 37c725f221c335bcf672c1d8966a5ff23be6184fdca99ef5d9df57e47d8530fe
font_01_sfnt_off00008628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8628 9668 bytes
SHA-256: 68c673c447345cfed13bb71146cd51e81c78083468b209354b714b4bffc876d1

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