Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f8aa14b2e76542…

MALICIOUS

PDF

59.4 KB Created: 2020-10-19 14:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 2fdee94917e7c960d6c9f405b7650f74 SHA-1: 5609e4ca2a3ba0f2e597613dfbf73be3ca2562ff SHA-256: a6f8aa14b2e765428c24ef7c59a04a03cffc6188479d1ed4d57c49ec07f14040
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://ttraff.link/123?keyword=check+writing+practice+worksheets In PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/1856695.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/fisutabamez.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/4d5351fbb209c0.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/wivorajum-segugosivupor-jojiwakunulubob-ridituva.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/6052482.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/bibejiworo_sidiwota_wurap.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/f26647d.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/119094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_5f8ac82f863e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368237/normal_5f899762dafd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5f8cce168313e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_5f8a1f723778c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_5f8ab61e543cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f873dfe52579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380080/normal_5f8c49de9161f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5f88749ec158f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f8736951b0c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5f8d6d61ddfac.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/1/0492/2372/9318/files/59297175054.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8361/9232/files/sap_fiori_strategy_standards_and_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8857/9233/files/brea_movie_theater_west.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/6945/8582/files/college_student_information_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4887/6697/files/incarnations_sunil_khilnani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce400b1f-8745-43ce-8be8-9ed2cff9c88d/56651659470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4173c69-9c56-4e85-bec7-6aa6d2037738/saleen_mustang_value_guide.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_off0000abc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABC4 5224 bytes
SHA-256: 7e96e4fe9ab0d00e042797d0d52c68c2f8a51331a6f1a7e82113336ca0819c1e
font_01_sfnt_off0000bd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD98 9868 bytes
SHA-256: dd4c564834e19567f45e2bd679416ab845e5e30bedbe52f70dc252fc9af0440e