Malicious PDF — malware analysis report

Static analysis result for SHA-256 6859f5ffb060b6ab…

MALICIOUS

PDF

43.0 KB Created: 2020-11-01 13:17:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5d1f862f5e53954267afdd321d571d9c SHA-1: e39d43423212e0c9a7737725b9b87dbebedd35d3 SHA-256: 6859f5ffb060b6ab241a7942c1cb6573ef7fb8dbcc763816943d85647467be39
154 Risk Score

Malware Insights

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

The PDF file contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is a manual for a 'troy bilt pony tiller', which is likely a lure to encourage users to click the malicious link. 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=manual+for+troy+bilt+pony+tiller In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5f964bfdd2db9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386836/normal_5f961f4d666d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418180/normal_5f9c0f69ce466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381546/normal_5f9430adbb03c.pdfIn PDF document text
    • https://fulojozizarotuv.weebly.com/uploads/1/3/4/3/134318677/ca8b86f790312b.pdfIn PDF document text
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/xizokawitigoro_sedawumenaj_guzamexumoke_zunopumuwifilo.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/1/0498/6221/3789/files/9404966326.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6829/2764/files/2421333984.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5544/7201/files/blue_marble_university_wikipedia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1568/3743/files/gudemijivolitopurazu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/mapurirozavirasipune.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4829/4807/files/my_talking_tom_2_download_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0549/0846/files/42964023819.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/technical_english_1_workbook_answers.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_off000067a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67A4 4964 bytes
SHA-256: 1511335dc0753fbabf2db337b69e31051fc52621266bba1017238cba72daea70
font_01_sfnt_off000078af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78AF 11196 bytes
SHA-256: e9cd0a3550bd55f3403eb88860d7ecef3026efdd45191a12dcb521b7bef7d96c

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