Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1155d088301fbe…

MALICIOUS

PDF

40.5 KB Created: 2020-10-13 07:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: fe59e921bd8c8ea177a5bea3bdbfc6a4 SHA-1: 62834799bad4aa172e622164c13bb7d8ce28d0a5 SHA-256: 4a1155d088301fbea3331350c947b9b3729ff1705c5ee662f139595b6d4bd7c9
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=voter+guide+michigan+primary+2020 In PDF document text
    • http://zejotero.christchurchnapoleon.com/uploads/1/3/1/4/131437241/koberolekedasonado.pdfIn PDF document text
    • http://files.cbd-iai.org/uploads/1/3/1/8/131871717/rotiturotozojawir.pdfIn PDF document text
    • http://files.unconventionals.org/uploads/1/3/0/7/130740493/xesumumupafi.pdfIn PDF document text
    • http://sukij.shopcompassrose.com/uploads/1/3/0/8/130874330/4632394.pdfIn PDF document text
    • http://jadeno.biblestudynotes.net/uploads/1/3/2/6/132681361/disudipijosi.pdfIn PDF document text
    • https://site-1038783.mozfiles.com/files/1038783/79887724949.pdfIn PDF document text
    • https://site-1048535.mozfiles.com/files/1048535/96039763580.pdfIn PDF document text
    • https://site-1042629.mozfiles.com/files/1042629/zomiwisebigabok.pdfIn PDF document text
    • http://files.cardinalbeadcreations.com/uploads/1/3/2/6/132682574/8661134.pdfIn PDF document text
    • http://ziketoput.mountaingappta.com/uploads/1/3/0/7/130776407/gopifobiwafelegefif.pdfIn PDF document text
    • http://files.lilacthai.com/uploads/1/3/1/4/131407299/5cad7eee2b2ab16.pdfIn PDF document text
    • http://files.healthyhomeplus.com/uploads/1/3/1/1/131164387/5bb2ca1169009.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/1c207f31-e42a-45b9-98f5-802bf2e6f00a/32373112714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1eb5a69-b835-4994-b541-a1738f4cbd1a/48791039519.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_off00005f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8E 5616 bytes
SHA-256: f7bd575cfe0f9ae3590085d544f0daa5adbb50d7bfeeb2b52df8f7c93bf148fc
font_01_sfnt_off00007294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7294 10268 bytes
SHA-256: 9b091719e0f5c1534f8f3121ba640f1391d17783c4a71f8fd72f512e40d22d5b