Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89043295bba4a27…

MALICIOUS

PDF

52.6 KB Created: 2020-10-02 18:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b0b348a2c400793fc9a649b5e1d8f40d SHA-1: e466ed435117aee31bb40a9c4b1da467b0d42bf8 SHA-256: d89043295bba4a2721da0fb02ecad4c2ff421b0c44e8f49e26113cb85b92a3e5
184 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to disposable hosting and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/strik?keyword=rubymine+no+sdk+specified. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to disguise its malicious intent.

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://cctraff.ru/strik?keyword=rubymine+no+sdk+specified In PDF document text
    • https://site-1040514.mozfiles.com/files/1040514/xobevozininovixepifonub.pdfIn PDF document text
    • https://site-1036621.mozfiles.com/files/1036621/75254815865.pdfIn PDF document text
    • https://site-1037260.mozfiles.com/files/1037260/nujumaxelif.pdfIn PDF document text
    • https://site-1037111.mozfiles.com/files/1037111/paxitetufafosovegazubetad.pdfIn PDF document text
    • https://site-1042510.mozfiles.com/files/1042510/jitas.pdfIn PDF document text
    • http://files.bskfmayfairbranch.com/uploads/1/3/1/6/131606343/fagam_lorawif_wubuva.pdfIn PDF document text
    • http://gavisi.metroblasting.com/uploads/1/3/1/3/131398452/54dce7b7b4c66.pdfIn PDF document text
    • http://files.wickedque.net/uploads/1/3/1/1/131163953/kebazufudoridisifo.pdfIn PDF document text
    • http://files.koers.co.za/uploads/1/3/1/3/131398125/7514810.pdfIn PDF document text
    • http://manozadu.halemalahina.com/uploads/1/3/0/8/130813528/bebuzuwikunikefani.pdfIn PDF document text
    • http://jevutebiz.animalguardianshorserescue.org/uploads/1/3/1/4/131453853/tizuwibosukum-kujududinut-vupib.pdfIn PDF document text
    • http://kugem.missionbrain.org/uploads/1/3/0/9/130969742/jurigazam.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/1/0484/6442/9217/files/capital_letter_z_in_cursive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/60972759365.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/5352/7452/files/dd_identify_cost.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5728/6820/files/baruzatezu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7367 4464 bytes
SHA-256: f2babf88c7a9c8ae3ea48e08557765ba5900fab2ea6f2c7571e545efca3fec2e
font_01_sfnt_off00008321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8321 5276 bytes
SHA-256: 5b8670941f9ef42f05673bbbc02ccf7db05dfd44bc6bf387e614511d5bbfe637
font_02_sfnt_off00009518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9518 14588 bytes
SHA-256: 14705c9e0f621f46ecc7de18f419d051fb8f2582273800a7ab61125c65682592

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