Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9988b8e907790c3…

MALICIOUS

PDF

37.9 KB Created: 2020-10-31 08:19:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 15c410eda3132bda3aca78c2683af1d8 SHA-1: c86b57df8825aededaea6e5c62973a91894ed996 SHA-256: c9988b8e907790c36a5944b7acc45d3804a8666d5a0b3d4bb842177fbc394246
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/aws?keyword=ps4+dev+kit+cost In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_5f95cdf15160a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378618/normal_5f8bacb26b46f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_5f942ed3e1dfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f873a9bc6a7e.pdfIn PDF document text
    • https://ritibamubube.weebly.com/uploads/1/3/1/4/131437410/mopijitaxaren.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f89c22a0d91d.pdfIn PDF document text
    • https://fotijaxak.weebly.com/uploads/1/3/4/1/134108731/456813799b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373281/normal_5f91aeb461cf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f8708859551e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_5f8a2b2fd0c18.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005856.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005856.bin)
    • https://uploads.strikinglycdn.com/files/20d38a52-0e34-4b37-bb7a-a9488a090b1a/86023872709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ed5b08-6b32-45bd-ba9f-b790493a95b2/astigmatism_test_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/business_model_generation_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/925396728.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/dufefupepiwizoku.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 extracted file (font_00_sfnt_off00005856.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5856 4808 bytes
SHA-256: 5b53b5205260e55bf037f633b3ef872fafe903bcd9237504650ec27988b0655d
font_01_sfnt_off000068df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68DF 10024 bytes
SHA-256: 531952a7c75c9b4d267b721290e4e122c4026e3189d1ad0d5d807476c8adc659

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