Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6404a9b199b82c…

MALICIOUS

PDF

44.2 KB Created: 2020-10-14 17:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 85a3187240d820a00140dd147919ff14 SHA-1: fe4635ac6ce35b78066e05caf174312380244131 SHA-256: 1c6404a9b199b82cf85df1293573ea8f46b44bcc729b03dfbb76621fd20f0f8c
124 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?keyword=marvel+avengers+academy+mod+apk+android+1`. The ML classifier strongly flagged this PDF as malicious, and multiple heuristics indicate it is a link farm hosted on disposable infrastructure. The embedded links likely serve as a lure to download malware or redirect to a phishing page.

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 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=marvel+avengers+academy+mod+apk+android+1 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5f86fbc9f174d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f87010b580e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f86fb38596e7.pdfIn PDF document text
    • https://site-1038423.mozfiles.com/files/1038423/wofakurexi.pdfIn PDF document text
    • https://site-1038372.mozfiles.com/files/1038372/metawodutapum.pdfIn PDF document text
    • https://site-1039636.mozfiles.com/files/1039636/78058638444.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/tebavu_mofevuz_punoxibera_gijipomole.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/fubisi.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/1/0481/4254/9145/files/41590407089.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9038/5823/files/the_warlocks_hairy_heart_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59a924ed-0d93-473c-988b-856f9df4a3c9/jumilumupeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a6494a-3631-4f72-9051-348999088be6/14759634592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/020dea67-de02-44b1-a852-f9d50e64c3bd/woxuramidujugekaraguz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/263c41d1-412e-4d0e-86c7-7f89c2cb2db1/nabisim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22080c0b-09b1-46b2-974e-713c44a9f17f/zajusekevajumidilez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2294/8264/files/concepto_de_didactica.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7937/1414/files/82464166505.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_off00006c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C29 5676 bytes
SHA-256: 100999f6e9136b0efc78cb81980dcba0220099df9956c689f8416cea5d270e19
font_01_sfnt_off00007f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F82 10540 bytes
SHA-256: 77019bf0200e14b75612ddd66121adfd2b94813084af268584043d569dfc9163

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