Malicious PDF — malware analysis report

Static analysis result for SHA-256 da13af467b275155…

MALICIOUS

PDF

58.7 KB Created: 2020-11-08 20:00:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 3bf304b163da759d633df1021471420d SHA-1: 7b79a76e646763cc9afa770db69b5c60b1b6cf54 SHA-256: da13af467b2751555030734893741b32c3f8be8b843efddab5bebf2439887ca6
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://traffmen.ru/123?keyword=chem+2c+lab+manual+uc+davis In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_5f8df64c4ca7c.pdfIn PDF document text
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/namozofe-mokedupuzujemag-rapazuxig-gemolidade.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/218b302b222536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413347/normal_5f941e1983491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384048/normal_5f987a8707e7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lukepepe/lil_wayne_backpack.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/22872414602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eede9a5-a820-4cff-842b-fbd6ced733f9/cs_1.6_cfg_indir_gezginler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/339e5350-2ed7-421d-a207-5bcc47bbe3e5/volvo_s40_2007_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9491d3e-d21b-4d6a-ae60-c5397ba1cfc6/48004306553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22ff040a-4768-431e-993d-cf03ea703485/2008_cayman_s_buyers_guide.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_off0000a49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA49B 5320 bytes
SHA-256: bc9dec2f7e5869e9fe165670e55ea8ec1ca592fda5ba13598de406ac75107907
font_01_sfnt_off0000b68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68A 11700 bytes
SHA-256: 50c9b468e5885283cc29d61549b27786043817fb96539e73e9bb490941985338