Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bed8f37b798300a…

MALICIOUS

PDF

51.3 KB Created: 2020-10-04 13:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b4b0960244fd77f297be0746e646e0ce SHA-1: 0ec99c6fd1c6042ee89e72c098f85584db10caa3 SHA-256: 5bed8f37b798300ad54b71a4afb738808e5a1b8508e1d6ee8b931f9f8bc07ed2
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://gettraff.ru/strik?keyword=redcat+racing+tornado+epx+pro+parts In PDF document text
    • http://files.charliehubbard.com/uploads/1/3/0/8/130814926/5519294.pdfIn PDF document text
    • http://fusukako.mcnamaragypsies.com/uploads/1/3/1/4/131438500/f1410b439a3.pdfIn PDF document text
    • http://files.jcvrs.org/uploads/1/3/0/7/130775623/17152f.pdfIn PDF document text
    • http://files.sparkrentals.ca/uploads/1/3/1/8/131856392/2258671.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ac257af-5e36-45d8-be60-70fa0e05ae45/86721529732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab8e8065-3de4-4f42-a4b4-9cee2e2bd46b/vepaxaxexesozisopupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e27b2bea-f23f-4d44-a1ac-19addaacc9b9/xoxereviwiwotaderiner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f9102ce-c797-4c86-9445-888f6b757080/wulilojufukebuko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6855/0037/files/1997_polaris_sltx_1050_repair_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4926/3004/files/63229155168.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2463/1976/files/bediluzagigutavaned.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/7164/0230/files/36249399482.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0679/5686/files/introduction_to_psychoanalysis.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_off00007f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F47 5284 bytes
SHA-256: 418102c7a287bf1d2c51ca9ce11ad27204ff8f0fac5026d41a5b9426e70953d3
font_01_sfnt_off0000915b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x915B 15508 bytes
SHA-256: 1861bbd8cba66eac2d40c8a7a51970fa2a710b473a5f24ace3784d5eb73d950c

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