Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a52c7df2ab40b0a…

MALICIOUS

PDF

38.3 KB Created: 2020-11-09 17:17:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: cc209986a4591c4ca6ef0d1cd7d97421 SHA-1: e6065f3c4c589dafff8da19025bc633402659122 SHA-256: 8a52c7df2ab40b0ae895a9180301cf39ace716fe7ff0af43ae185fc82584986d
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://traffking.ru/strik?keyword=us+elections+project In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_5f9ba02945739.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/4733702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476135/normal_5fa7c3330e201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392877/normal_5fa54e2e4bc90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413223/normal_5f9f429d5c54b.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/jinabisura/harpreet_brar_olympia.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/swords_and_sandals_su_hacked.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/mide_botoksu_nedir.pdfIn PDF document text
    • https://s3.amazonaws.com/pojojagajevuxa/lps_school_lunch_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/right_triangle_trig_word_problems_worksheet.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_off000058bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58BF 4784 bytes
SHA-256: c238d912796c052cae87a000a7ee09f5b115e8dcee8e3469e770467c403233c3
font_01_sfnt_off0000691e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x691E 10584 bytes
SHA-256: de0f757558f8d6cac156cf6ac6a29466f3717473045d6c310178540f80600146