Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2454f567d84a109…

MALICIOUS

PDF

42.8 KB Created: 2020-10-12 16:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: f3b631436f5b16655f9839394aed173f SHA-1: 7880b60690e0614a927d796f414df1e6e0bb3a0b SHA-256: b2454f567d84a109ffaa1370ee14a9d6bd637f1d0bebb27f63d537ace10f2759
184 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=crash+course+us+history+9+worksheet In PDF document text
    • http://lefepawi.bewellacupunctureclinic.com/uploads/1/3/0/9/130969813/zitofaka_vaduderoboz_lexiviwovepiw_bofopugokawidon.pdfIn PDF document text
    • http://files.myclipartcafe.com/uploads/1/3/0/7/130739646/jubuzanojavan.pdfIn PDF document text
    • http://files.michaelsmarketingagency.com/uploads/1/3/0/7/130739504/rewiwoza.pdfIn PDF document text
    • http://files.patriciabridewell.com/uploads/1/3/2/7/132710665/4488224.pdfIn PDF document text
    • https://site-1039743.mozfiles.com/files/1039743/zejefukexonijap.pdfIn PDF document text
    • https://site-1044200.mozfiles.com/files/1044200/43412838062.pdfIn PDF document text
    • https://site-1036932.mozfiles.com/files/1036932/64440354899.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/98cf86cb-043a-49f3-99c6-57e3782cbf53/waxadevuxasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe56f166-9d42-40d2-8ec1-0515e21ebd4a/88929906888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10dba649-0131-4be2-a3b7-51883bb4a16c/48999208339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e913fb-424e-4189-9ff9-e1a9ff248340/subilubotexag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99d2497e-a83e-4bfc-8d66-17244970dfce/gatojoruxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/380b613f-1c44-4670-b674-6bb2adf58505/sidumebofonupenafut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d7d926-dcbd-494d-b0d6-d8130460bb24/mewowovenubu.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_off00006a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A07 5176 bytes
SHA-256: 7fe7e91524ee6f2986a7098774650d9bc6e473efa849d6755efe29c81f31f0dc
font_01_sfnt_off00007bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAC 10152 bytes
SHA-256: 7f565ee0607789426cdae0859dc310759f9318515dd52960d745e1aad84de294

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