Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c864edd388fb64b…

MALICIOUS

PDF

33.8 KB Created: 2020-10-05 11:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 22a63ba4ea5b22f9b5b47418a71a8109 SHA-1: b7657a1e13663c0a80a859d1ce6f1d99db022e52 SHA-256: 1c864edd388fb64ba20b4b20aaf3f6d47fad7433f3ada06da962490595d15b39
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files hosted on disposable domains, a technique often used for SEO manipulation or to distribute malicious content. One of the embedded URLs, 'https://gettraff.ru/strik?keyword=pearson+english+for+information+technology+teacher%2527s+book+pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/strik?keyword=pearson+english+for+information+technology+teacher%2527s+book+pdf In PDF document text
    • https://site-1042978.mozfiles.com/files/1042978/ronan.pdfIn PDF document text
    • https://site-1037878.mozfiles.com/files/1037878/wekefizizudukikedovanilu.pdfIn PDF document text
    • https://site-1036772.mozfiles.com/files/1036772/76995638030.pdfIn PDF document text
    • http://files.keenefarmersmarket.com/uploads/1/3/1/8/131872021/pojebetorif.pdfIn PDF document text
    • http://gunavux.jenroweaicp.com/uploads/1/3/2/7/132741100/bapimoj-didivopefum-sapiduraju-wiwejakidexof.pdfIn PDF document text
    • http://files.fittingroomligonier.com/uploads/1/3/1/4/131452804/80b06.pdfIn PDF document text
    • http://xiwirizub.antiqueautomobilia.com/uploads/1/3/1/8/131857419/mepavafonuf-xulakovo.pdfIn PDF document text
    • http://zepen.b4pclothing.com/uploads/1/3/1/4/131437252/rogozawafagofizetim.pdfIn PDF document text
    • http://lanetika.stallaureas.com/uploads/1/3/1/3/131383657/5879847.pdfIn PDF document text
    • http://fonerovu.sandiegopottersguild.org/uploads/1/3/1/3/131381806/6614200.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/3241fabd-bb78-4d49-a5b0-8d7a8032aaf1/lapokudifofewexipexeso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97ebc39b-508e-4ea5-8496-9b48de715786/80126962446.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_off00004416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4416 5908 bytes
SHA-256: e9230654fa59f003e7de0ec0351965ddd5022bfbdb83cd8af68938875e117e4f
font_01_sfnt_off00005819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5819 9900 bytes
SHA-256: 15162ecbce78356da16607d3212c117fb8f1b6479619258b0da677a462c39631