Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4ac6fd2d4ab22b…

MALICIOUS

PDF

133.0 KB Created: 2020-10-03 08:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 039590e4821fd7798830a12a49f0ee82 SHA-1: f35706948a0d21595cecbb115ff2705d9a782ea4 SHA-256: 5a4ac6fd2d4ab22b215bca32393c5724752ca5290e3693928be9dd60d85cdd68
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://cctraff.ru/strik?keyword=bangalore+building+bye+laws+2020+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain the same URL, suggesting the primary purpose is to trick the user into visiting a malicious site. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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=bangalore+building+bye+laws+2020+pdf In PDF document text
    • http://files.mrsmccschooldays.com/uploads/1/3/0/7/130739155/5003973.pdfIn PDF document text
    • https://site-1037044.mozfiles.com/files/1037044/figexezudodexidigijene.pdfIn PDF document text
    • https://site-1036982.mozfiles.com/files/1036982/filijokuraminewo.pdfIn PDF document text
    • https://site-1036958.mozfiles.com/files/1036958/14528123925.pdfIn PDF document text
    • https://site-1036786.mozfiles.com/files/1036786/94127568832.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/4ae0aeaf-2a1e-4772-b047-20fe1387e940/74562377562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f45a1b5-36c6-4777-bd04-baf17fe7b463/vazopatasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03574fa9-20e2-4643-bd38-056cb4b9eb87/zesewaton.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5077/8269/files/canon_pixma_mg2520_printer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7106/5250/files/wisconsin_rapids_police_reports.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2779/8944/files/there_was_there_were_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6167/4133/files/in_general_where_do_earthquakes_and_volcanoes_occur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/2518/6971/files/fidenulixuxup.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_off0001cf21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF21 5864 bytes
SHA-256: 8985c59d48aae12f9d569cb0b6dc394514870beda1b64eb290f42fc31383905b
font_01_sfnt_off0001e33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E33C 10400 bytes
SHA-256: 3c0eec8536da98930e15618f023a2e8d085626378d6c63c94c7ae51b922fa0a4

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