Malicious PDF — malware analysis report

Static analysis result for SHA-256 4986237a7f513a68…

MALICIOUS

PDF

38.8 KB Created: 2020-10-01 23:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 5672ed7d4c96326f05b76db934b4270b SHA-1: 8d3668e8bb496929e864b2771dfc341117a5a697 SHA-256: 4986237a7f513a688b007810d856f113713dfa7c114c0156c0c24e78989f17ba
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/strik?keyword=cisco+ccna+routing+and+switching+200-125+pdf+free+download In PDF document text
    • http://kijigig.kosloskiart.com/uploads/1/3/2/6/132695384/190c5386d13ad.pdfIn PDF document text
    • http://sugukefoj.troop1hickory.org/uploads/1/3/1/4/131453133/7214634.pdfIn PDF document text
    • http://teduginus.kohphanganinsider.com/uploads/1/3/1/4/131407021/gaxasuwutipib.pdfIn PDF document text
    • http://vuxuwolut.enotecaathena.com/uploads/1/3/1/3/131379015/4260e27410a6e32.pdfIn PDF document text
    • http://files.primelashandbody.com/uploads/1/3/1/4/131437444/pelirusutoras-wodigazamuzekig-jigefufaxid-moganuzawa.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/1/0486/0303/7854/files/tuperiladekozugi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7575/1067/files/geximakuvakosojo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/8897195709.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2287/6324/files/fuck_me_silly_mia_isabella.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/0115/2163/files/gupun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/0098/1398/files/india_vs_england_final_live_streaming.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7885/2507/files/14569646259.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8242/7815/files/death_of_a_salesman_study_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/071b7dcd-a681-41e3-8d22-835c9346d3fa/teguj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4069218-1ef9-468f-8714-525966f545c0/tigomixiguja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cb81848-b7ba-4925-b475-f70b4fd6b4b4/89424119051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/607f38fe-2bc6-4359-9953-1bafc01bd9f6/povixugo.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_off000056b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56B6 5896 bytes
SHA-256: af21b7e76602e910d6034a6c8f0036a6db897933a86546f4aed54f1230af5d97
font_01_sfnt_off00006ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE5 10464 bytes
SHA-256: 4fa812e867f4c749e041031c77bee6e31bed9bc7e1c17973f792db612f594268

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