Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e36c404c18bd0da…

MALICIOUS

PDF

40.9 KB Created: 2020-10-05 00:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4635ad9a8bfebb2e0b18b29b5c4c742f SHA-1: 5885469c14052c5f299650836b75ee02b8ab0eae SHA-256: 4e36c404c18bd0daad2411e3d409d7956d745f823351b93f31c4ffdce896d2ad
224 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to disposable hosting. One of the embedded URLs, https://cctraff.ru/strik?keyword=kuesioner+discharge+planning+pdf, is identified as a malicious redirector. The document also employs a social engineering lure, instructing the user to install a browser extension or update to view content, which is a common tactic for malware installation or credential theft. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=kuesioner+discharge+planning+pdf In PDF document text
    • https://site-1037202.mozfiles.com/files/1037202/vupevejukoxokokitaluwezij.pdfIn PDF document text
    • https://site-1038779.mozfiles.com/files/1038779/25139479035.pdfIn PDF document text
    • https://site-1039804.mozfiles.com/files/1039804/31331208262.pdfIn PDF document text
    • https://site-1037061.mozfiles.com/files/1037061/gatov.pdfIn PDF document text
    • https://site-1037261.mozfiles.com/files/1037261/76242409534.pdfIn PDF document text
    • http://files.reflexinstitute.ca/uploads/1/3/0/7/130739935/3914848.pdfIn PDF document text
    • http://files.hhomeh.com/uploads/1/3/2/7/132740614/4fd6f1d0751ef5.pdfIn PDF document text
    • https://site-1037044.mozfiles.com/files/1037044/nodoxuvu.pdfIn PDF document text
    • https://site-1037282.mozfiles.com/files/1037282/gitikamogojikerorujip.pdfIn PDF document text
    • https://site-1039161.mozfiles.com/files/1039161/mikap.pdfIn PDF document text
    • https://site-1038728.mozfiles.com/files/1038728/kizakowaroso.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/1/0482/5894/1090/files/72082844223.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8979/1643/files/pans_labyrinth_synopsis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5777/3728/files/nawomuxowubesesisipesidol.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_off0000624e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624E 5388 bytes
SHA-256: 788db9dce268a52f907dd423f35e9a20438129f2bd7670dc36f6ff8ae5fe62d5
font_01_sfnt_off000074a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74A7 9968 bytes
SHA-256: 8d07a4a0d81453862376907987e737c118eb09e2c2e9560cf6c53ec1802af286

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