Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3df7cba13c922b…

MALICIOUS

PDF

41.4 KB Created: 2020-10-07 18:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d5570a4c6d7ae35e3cb6326b5cbdd3f5 SHA-1: 71e28ee4dfd22bd5081f839f0acce08d4221a929 SHA-256: 9c3df7cba13c922bd1d0389fa59ddd7e283f029a4b18d084d8c359785dc6d616
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to redirector infrastructure and potentially malicious domains. The ML classifier strongly indicated maliciousness, and the presence of a redirector link suggests an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm.

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://ttraff.link/pify?keyword=horsemanship+merit+badge+worksheet In PDF document text
    • http://files.coachscottschemistry.com/uploads/1/3/1/6/131606257/tifuwujujal.pdfIn PDF document text
    • http://files.workinnvision.com/uploads/1/3/1/3/131384018/zudemesenodevakani.pdfIn PDF document text
    • http://files.celebratekidslv.com/uploads/1/3/0/8/130813558/7725177.pdfIn PDF document text
    • http://jarotid.westcroftcommunitycentre.co.uk/uploads/1/3/1/3/131379379/makogupegokufoj_wezexeja.pdfIn PDF document text
    • http://files.easponza.com/uploads/1/3/1/0/131070137/3092356.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/1/0460/6948/1636/files/amazon_case_analysis_executive_summary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/6988/1499/files/university_of_detroit_mercy_dental_school_covid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/1296/3482/files/64697891102.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4209/8337/files/math_ia_topics_calculus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9399/3893/files/cover_letter_for_electrical_engineer_fresher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c50d13-fc3c-4afc-b6ca-b863025d1fce/47697389508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2ce868-5ce9-4ac6-8339-81fc72326140/lutelukexesux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc2986df-438c-4556-9c20-ab2181584a46/wewevud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1abde7f3-4ec3-447d-bad3-472ea81bf02e/luruto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53cd674a-5f24-43b9-aa0e-dad964292e1e/kogumikis.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_off0000626f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626F 5596 bytes
SHA-256: 3bd42515b7b101d411484cfa84745ee7381867c161ebf3b35c93ccced9c41f69
font_01_sfnt_off00007555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7555 10336 bytes
SHA-256: 0f9650d14e951d0de81f6a419bfd30cbdfcf1236939fafd07f06a938ee37c031

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