Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8e95cabf72aaad…

MALICIOUS

PDF

46.5 KB Created: 2020-10-05 15:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7e44a85a0d66836a49dff0c8e0d02218 SHA-1: 665ef2b66b3ee8695f14888d5234f46149451fc0 SHA-256: 3a8e95cabf72aaad7400d01a6b9e980650ff0ba0066f4ef828aa76cadf18a8ec
184 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to disposable hosting and a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://cctraff.ru/strik?keyword=achievement+unlocked+3+guide, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent, possibly related to SEO manipulation or a phishing campaign.

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=achievement+unlocked+3+guide In PDF document text
    • https://site-1044018.mozfiles.com/files/1044018/jipejinorewaweluve.pdfIn PDF document text
    • https://site-1036649.mozfiles.com/files/1036649/lusekajetevejina.pdfIn PDF document text
    • https://site-1040514.mozfiles.com/files/1040514/dopibudodelav.pdfIn PDF document text
    • https://site-1037848.mozfiles.com/files/1037848/rekibaguri.pdfIn PDF document text
    • https://site-1039171.mozfiles.com/files/1039171/rupejinu.pdfIn PDF document text
    • http://files.thesalvagesisters.net/uploads/1/3/1/4/131452903/ad8f675d.pdfIn PDF document text
    • http://xinamoj.kansasnursingstudents.org/uploads/1/3/1/6/131636725/fesirir.pdfIn PDF document text
    • http://files.createunboxed.com/uploads/1/3/2/7/132712116/tojuwivorat_fovolijumin_nelozopube_gapog.pdfIn PDF document text
    • http://files.thepeacesyndicate.org/uploads/1/3/0/9/130969663/8556185.pdfIn PDF document text
    • http://xosotega.colinjacksonmd.ca/uploads/1/3/2/7/132710797/059a5a8bfa03c6e.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/e7bd206d-ad7e-4886-9d3d-2e0ae999ea2f/15155375064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a492ab4-c9f2-4ef9-b430-3e0bd09ec426/jugovatufibefisafedekot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/424d7551-59f5-492b-90f2-fbb10efa1d06/12377686825.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_off00006f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F65 5144 bytes
SHA-256: 516691325498e9e4adf2082e5156cde55e217edc587a555d15aaff4898d34e95
font_01_sfnt_off000080d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80D4 14120 bytes
SHA-256: adf143c9e7a3323579fbbb40be77645531d7f333fcdfbf7ebe5a02534cbf5c18

Open this report in the interactive analyzer, or submit your own file for analysis.