Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43ef784a2dc04b8…

MALICIOUS

PDF

45.6 KB Created: 2020-10-10 21:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 80903b53c27e2f080c7d096f693fb089 SHA-1: e031445dba7cd5111c3a937111eca0b0f9a8dcce SHA-256: a43ef784a2dc04b81981ebfbed9dbe9de923be04c9fc08762fefdecb5237ba95
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=kingdoms+of+amalur+alchemy+guide In PDF document text
    • https://site-1037088.mozfiles.com/files/1037088/83626033997.pdfIn PDF document text
    • https://site-1036695.mozfiles.com/files/1036695/62735206463.pdfIn PDF document text
    • https://site-1036694.mozfiles.com/files/1036694/tekumawejisokofimabif.pdfIn PDF document text
    • https://site-1041295.mozfiles.com/files/1041295/sunofumogivesuterigezub.pdfIn PDF document text
    • https://site-1036681.mozfiles.com/files/1036681/tiwesilufodolak.pdfIn PDF document text
    • https://site-1038332.mozfiles.com/files/1038332/69150198868.pdfIn PDF document text
    • https://site-1036987.mozfiles.com/files/1036987/10700950038.pdfIn PDF document text
    • https://site-1040374.mozfiles.com/files/1040374/75314229545.pdfIn PDF document text
    • http://xixupanit.saintarmandventures.com/uploads/1/3/1/4/131438282/rukir.pdfIn PDF document text
    • http://puxuda.blacktidefishing.com/uploads/1/3/0/9/130969077/favutojeluz_gavagogove.pdfIn PDF document text
    • http://files.pcomproperty.com/uploads/1/3/1/3/131383269/denanetozeba_jirigilera_nuworasi_wikowalu.pdfIn PDF document text
    • http://nusuweve.zongxinqian.com/uploads/1/3/1/1/131164250/9b9d9ee.pdfIn PDF document text
    • http://files.childrensworldmontessori.org/uploads/1/3/2/6/132681144/3065102.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/1/0431/1911/6449/files/domepekarulamifa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/6444/3299/files/rodan_and_fields_order_status.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_off0000736e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x736E 5504 bytes
SHA-256: b9d0678db0ea2ba88209ec41ad319a89b4d7c0f3c7988c4241911e8f6e906863
font_01_sfnt_off00008600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8600 10368 bytes
SHA-256: 899ee0c66902c8e13c70dc851c7512fb3014bb2ecf4a20286ec1af2815d61353

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