Malicious PDF — malware analysis report

Static analysis result for SHA-256 5780b019e58e9f2a…

MALICIOUS

PDF

41.2 KB Created: 2020-10-08 05:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 771a5ae781e440c29f93b29c20ec5a5a SHA-1: 780cd3540246aed96dd417fc4d18aeaa170f577f SHA-256: 5780b019e58e9f2a1706d3108c9fc64e3cffecbf25afa80f6e1b5d5ad8fd4732
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple embedded links, with at least one identified as a redirector to malicious infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a deliberate attempt to host numerous external links, likely to facilitate phishing or distribute further malware. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=libros+de+excelencia In PDF document text
    • https://site-1039932.mozfiles.com/files/1039932/40403126674.pdfIn PDF document text
    • https://site-1037094.mozfiles.com/files/1037094/kikefapibuvug.pdfIn PDF document text
    • https://site-1038360.mozfiles.com/files/1038360/jobijamuxalinoba.pdfIn PDF document text
    • http://files.mariozaragoza.net/uploads/1/3/1/3/131384468/81722f61a65fb0a.pdfIn PDF document text
    • http://files.appalachianwild.org/uploads/1/3/0/8/130874045/zoxozafabo.pdfIn PDF document text
    • http://files.reunitingyoga.com/uploads/1/3/0/7/130775998/mijubutuwosajo.pdfIn PDF document text
    • http://mupopegi.jbirdsnacks.com/uploads/1/3/2/6/132682467/9bd19e005.pdfIn PDF document text
    • http://files.drallisonsolomon.org/uploads/1/3/0/9/130969076/6056779.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/1/0432/2453/1101/files/logagiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7895/4389/files/meiosis_and_mitosis_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1531/5349/files/dividepuwopalanojorofixot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1634/1672/files/61417857723.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2120/5145/files/26304545734.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8472/9502/files/28662909504.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0980/1365/files/38558722418.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_off00005f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F84 5084 bytes
SHA-256: 5f437304eea0b935b06ac52aea51923767b41c85ee06e19215329ea6f42df383
font_01_sfnt_off000070de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70DE 11524 bytes
SHA-256: 3798184a7b2466467b51a1b147a8aeaf1c8952625796128de27d353a26929540

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