Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb984aabefafaf1…

MALICIOUS

PDF

35.2 KB Created: 2020-09-30 16:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b3cf8b1bca95a7d6d0dba7f5bea5dd30 SHA-1: 6510aee95699a01500847b6a849381bc467b3632 SHA-256: efb984aabefafaf1ed4deee6e6322d5a68fbf6e7a00ec6eaefa4115dceb2568b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links to external PDF documents hosted on various domains, many of which appear to be disposable or associated with link farms. One of the primary links, 'https://gettraff.ru/strik?keyword=sedimentary+basins+of+india+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a campaign to manipulate search engine results or distribute further malicious content.

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=sedimentary+basins+of+india+pdf In PDF document text
    • https://site-1037245.mozfiles.com/files/1037245/lulanemukululegoti.pdfIn PDF document text
    • https://site-1037022.mozfiles.com/files/1037022/wogufugokigagurawolagik.pdfIn PDF document text
    • https://site-1036681.mozfiles.com/files/1036681/2172282650.pdfIn PDF document text
    • https://site-1036783.mozfiles.com/files/1036783/nalarapasanololil.pdfIn PDF document text
    • https://site-1037177.mozfiles.com/files/1037177/9230477048.pdfIn PDF document text
    • http://files.jphono1.com/uploads/1/3/1/3/131398134/61387fa8fa8e136.pdfIn PDF document text
    • http://kegogo.balloondecorators.ca/uploads/1/3/0/8/130874179/1087560.pdfIn PDF document text
    • http://files.danandcloverhomebb.com/uploads/1/3/1/4/131406925/2579212.pdfIn PDF document text
    • http://files.savetootgarookswamp.org/uploads/1/3/1/3/131379099/xumabu-konusevixeroler-relib-zukokowakuxo.pdfIn PDF document text
    • http://files.hipsterwatersling.com/uploads/1/3/0/8/130813827/ninufoluwodi.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/b7ae7e2f-bab5-48f3-9a98-173179881df5/80049917281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/711eb3d5-e05c-418d-968a-5aeba9f0a15c/rufoxovov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8593794-2f2c-4cc1-978e-73ec9cfbc5c2/polewiledizivubelot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88c5a428-7abc-4be2-86f6-7e128e296aee/71290803968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a02a54c5-9811-4bb2-9c12-88fbdf0d0f90/jipijinurobetatadifekati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a45baaf3-2250-48d5-a7b2-2b0b8e14c6ce/figasesesawejafitefux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb66ee60-2661-462d-bae6-b0ba47791cad/93368902666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec382e21-71c7-4f82-b760-eb394962bb53/dowusizudebixo.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_off00004cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CAD 5500 bytes
SHA-256: dc0063e205bf1250a9f1cd7f073f8352e265b8c2c7b4ad9ec20ba2fb7c4c84e1
font_01_sfnt_off00005f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F41 9564 bytes
SHA-256: e0aaf888eb757d2f688f05dce24bbd248d8d1b6841bcb79b074b01b473096711