Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4af15fea2d624ef…

MALICIOUS

PDF

42.0 KB Created: 2020-11-02 18:25:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bcc20bd32ffde5a6c1771ff45e260e57 SHA-1: d55f35af41821e42eeddae2e74bd1fe5723eae01 SHA-256: d4af15fea2d624ef8f09c844932aeaad185203c91b3456bcef74edfa3c7d45e4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body and heuristics indicate a link farm strategy, likely to drive traffic to malicious sites. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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=captain+marvel+putlocker+hd In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f8b1329675a3.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/nuvaw-kekido-ligudajo.pdfIn PDF document text
    • https://wilofera.weebly.com/uploads/1/3/4/4/134488721/018f26b719a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393628/normal_5f97a59c004c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_5f93d46ac4413.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/6305828.pdfIn PDF document text
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/riwiw.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/1198201.pdfIn PDF document text
    • https://jizufolikoni.weebly.com/uploads/1/3/4/3/134349493/bdc4a235f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405660/normal_5f92170d2988a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/loneminovu/economists_assume_that_business_firms_attempt_to_maximize_their_profits.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/zunifosoxisiwadilagumo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4749/1486/files/witepix.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/judge_this_cover_brittany_renner.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/26448803676.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/dragon_ball_z_final_stand_wiki_top.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/8463/6320/files/71683689102.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_off00006598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6598 5164 bytes
SHA-256: d9478c8cb1501c8ba05cdccfcce38c7c65a7ac6d16cedbb3aa18d47cdde99536
font_01_sfnt_off00007703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7703 10584 bytes
SHA-256: c1abe7f28b17011d106c63c0051842e28c98228354a1e319f8cf75ff97b1122c

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