Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b735a0c44205fed…

MALICIOUS

PDF

44.1 KB Created: 2020-10-06 17:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cd920f61e41a2231ede32198dabc2e53 SHA-1: 54918ebdfa06977d1c4afc4e251135716513e6db SHA-256: 5b735a0c44205fed68ac50b7458c356cea0c2b9bbd35664d5bf71f847133837b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector pointing to a URL associated with cracked software. The document body, though heavily obfuscated, contains references to the same malicious URL and a large number of other PDF files, likely part of an SEO link farm. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/strik?keyword=nba+2k14+crack+fix+lag In PDF document text
    • http://files.smallberrygreen.com/uploads/1/3/1/4/131406075/salagisomifese.pdfIn PDF document text
    • http://zemiwus.gemwomen.org/uploads/1/3/1/8/131856772/wafipeja_romejadoxe_pivatamebagog_dejatekinazusu.pdfIn PDF document text
    • http://fopuroxem.speakupsaveamerica.com/uploads/1/3/0/8/130814328/1684842.pdfIn PDF document text
    • http://nutajed.canyoncitygrill.com/uploads/1/3/1/1/131163914/xupozuvut.pdfIn PDF document text
    • http://files.carolinejunkins.com/uploads/1/3/0/8/130874566/8f875383d.pdfIn PDF document text
    • http://files.wxrringtxn.com/uploads/1/3/1/3/131379420/7472861.pdfIn PDF document text
    • http://fobutopow.cedarspringschristianchurch.org/uploads/1/3/2/3/132303382/dccd4.pdfIn PDF document text
    • http://fazozu.wilsonracingesports.co.uk/uploads/1/3/0/7/130775162/zipedivarufakigi.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/1/0428/7571/5743/files/kazenapuregupizexeboke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6262/3893/files/44440984926.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/basojamumo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8377/5130/files/56260380627.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3881/3589/files/lumotixapoposolanik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a08073-430b-42be-962f-f10ed675f542/29296098007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff1e53dc-aab5-4f87-8bd7-6e7a2fd0efe3/temenosizoxuwij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa9e5d11-d135-4c58-8d87-012e1b708113/dafizizanojekolutado.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_off00006d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D25 5384 bytes
SHA-256: f4036bcad30f05ef94d92bc3271d3460608b14ae37be68463ac699f72244fc13
font_01_sfnt_off00007fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA6 10688 bytes
SHA-256: f7006ab335e35500256967cdd6628551a9e665db1b5bafbf71e1613aafb1e280

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