Malicious PDF — malware analysis report

Static analysis result for SHA-256 255cd1e7a8e24a93…

MALICIOUS

PDF

44.2 KB Created: 2020-09-30 14:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 96f6601fe613be6f7ddab0905bbcd15a SHA-1: 859170c0443360cc8ba9e2943527df0173201db8 SHA-256: 255cd1e7a8e24a938ef64cb403e612baecf022783aefb8008f59890f5486faac
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=tipo+de+investigacion+descriptiva+pdf In PDF document text
    • http://senox.kodleague.com/uploads/1/3/1/4/131482812/9602015.pdfIn PDF document text
    • http://gijuwuz.conlonlandscapinginc.com/uploads/1/3/1/4/131437693/pogarixuj_fekubavavi_laxanizos_wezokomomon.pdfIn PDF document text
    • http://files.infinitywellnessconnection.com/uploads/1/3/1/4/131408170/sugobe.pdfIn PDF document text
    • http://woneka.zackannfitness.com/uploads/1/3/0/7/130776677/roginurejuxakorepodi.pdfIn PDF document text
    • http://rarujinaf.objectpages.com/uploads/1/3/1/4/131453872/jogadug_falerun_visimuleve_fibawesazu.pdfIn PDF document text
    • http://files.knightsschool.com/uploads/1/3/2/6/132695719/mowutabix_loseme_sadatilu_xosivira.pdfIn PDF document text
    • http://deruk.cherylnewmanmd.com/uploads/1/3/1/3/131384714/sugizixidowegasasas.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/b9ae3d86-7032-4d35-89ab-77c49f0590b5/33181315330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7720255-32ec-4b7d-b567-689f9aedd7f2/39388809991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5515e973-fc00-459a-84c4-8e574a9f16a1/jiwisugabinopowaj.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_off00006ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFB 5300 bytes
SHA-256: cbf810a4d5214a1e0b7b08c06c8d71c7a9f835d5dbe778db591d75c3b8be3fbf
font_01_sfnt_off0000821c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x821C 9964 bytes
SHA-256: 8e5291ad51d3c19c11ea58320750e1df4983823d4952726799ef4dd1db604775