Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cdb610d58bb0d6…

MALICIOUS

PDF

41.0 KB Created: 2020-09-30 10:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 146e4ec7f75d57d2293e254773d00ab0 SHA-1: 7be6a92ef8372d3c8d015b25cae4b723db1aeb0d SHA-256: 45cdb610d58bb0d6f05d5bf19588c682874adb43df5b7269e3f928216eb39eca
94 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for downloading a file, specifically mentioning "Apple brand guidelines pdf download". The ML classifier strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://gettraff.ru/strik?keyword=apple+brand+guidelines+pdf+download In PDF document text
    • http://sokev.emw-d.com/uploads/1/3/0/8/130874429/koteluguxu.pdfIn PDF document text
    • http://files.mychristianoccasion.com/uploads/1/3/2/7/132711966/bomedu.pdfIn PDF document text
    • http://files.petitepetalsbyflo.com/uploads/1/3/0/7/130738596/befuwevif-nemebaramapi-pumiv-zakebejiza.pdfIn PDF document text
    • http://nabasa.wairaid.com/uploads/1/3/0/9/130969179/soletofovis.pdfIn PDF document text
    • http://files.thereadventurer.com/uploads/1/3/1/1/131164350/refebobobede-gapug-wigexakuzagis.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/16d19d87-8fd0-413f-aa0e-77f947245713/putijajamamemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe549fbd-974a-4918-aceb-25e038f1e90a/bubozivelaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7720255-32ec-4b7d-b567-689f9aedd7f2/39388809991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ebe28f-1b84-4683-99c7-f209a2591d9f/moluxunifinizepolavegu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0775/2866/files/83842755828.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5489/0149/files/87025791027.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9639/9265/files/antonio_cassese_international_criminal_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35c12374-9ad5-4c23-8800-58c5313e152f/66539892156.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b82cad1b-dda5-4f94-9e99-993ce83b07d4/muwuroporijomaj.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_off0000619b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x619B 5432 bytes
SHA-256: 63995b25d9bf73005aeacffc61eaafba9f625ab5821b85adf29fdb47a2e56381
font_01_sfnt_off00007428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7428 10288 bytes
SHA-256: a7fd8e34e65742d9d864ebc06c5e45455c94a3f3e255fd39288e95ceaa039b71

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