Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03dfc8362eff39e…

MALICIOUS

PDF

46.3 KB Created: 2020-11-02 08:36:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8df73ce2374093d66860b9ea1d726b5e SHA-1: dc7ea29ba4c04863ce3ab929f5274999f8ccd4f7 SHA-256: d03dfc8362eff39e4cda9f14c0c8d6537e1f65c118da18152ab15ab8c9a1f005
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDF files, a technique often used for SEO poisoning or to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/strik?keyword=2020+player+rankings+basketball. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=2020+player+rankings+basketball In PDF document text
    • https://judemozosuduj.weebly.com/uploads/1/3/4/3/134306717/7459171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383572/normal_5f985a54439e3.pdfIn PDF document text
    • https://vukasusig.weebly.com/uploads/1/3/4/3/134349680/xifapufu-fenivagi.pdfIn PDF document text
    • https://dasateju.weebly.com/uploads/1/3/4/5/134582383/pamaranala-jumaxujopadod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5f8734ad94415.pdfIn PDF document text
    • https://refanoripusegu.weebly.com/uploads/1/3/4/3/134306014/borowojiwipikop.pdfIn PDF document text
    • https://sazaxadapu.weebly.com/uploads/1/3/4/3/134330736/papopawiwubalu.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/1/0502/4979/3698/files/hotels_gloucester_maine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3768/2583/files/89585469770.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8580/0645/files/dutuveradovevebuxozun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a97f3da-aced-4894-827b-c180341c2704/24425252950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4850a0e-124f-4ee2-a530-079f73497197/78482023303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc1054cd-69d2-492e-8d6a-4cfd2a65e538/tajafonetowowujazawise.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3838/7607/files/73766009085.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5430/7774/files/koxigasukizime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/296129ae-6bb0-40c8-b38d-05586dd4b3ab/58088598343.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_off000076af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76AF 5472 bytes
SHA-256: 7be82a157d43870abcedebed4294f85b9dfb2173ea84b50c35eac76e14e7bd43
font_01_sfnt_off00008964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8964 10148 bytes
SHA-256: 2873a877a8d92c9dde5d046c831f70c07d0dfc92f8caeae22c07fb3e1e667918

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