Malicious PDF — malware analysis report

Static analysis result for SHA-256 4535a51b20859a09…

MALICIOUS

PDF

41.2 KB Created: 2020-10-16 10:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8f258b7f5d650186e8d8aca23e69b29e SHA-1: 62b88eff2c2f87bdc94950e5548f50c150353174 SHA-256: 4535a51b20859a09181d4c5e477ff4fa07ac4c606d6539e8d9aabcd2bdf423f7
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 heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a high likelihood of this document being used for phishing or distributing further malware. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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/123?keyword=neti+pot+cvs+instructions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5f873d80955e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5f882a5c9ba2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f874661cbaae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f883540dcde0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f88c1ec75299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f870414dcd26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_5f891aa0f10ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f87735acf0ad.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/birozalulup-gojarubag-regobagediz-bepiza.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/serowo.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/c2f41a2a-0b96-49b0-bcee-c3f206e62395/mipil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f6918d6-699d-46db-beb3-8ac86ea1dc3c/fogofujebufalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b77a3843-9b97-4b41-b7ac-784a039ca041/44373074484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/086f8613-28ec-4fa0-b17f-9b1064271825/60667240034.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/6409/9484/files/dusupisawovinevevoziside.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7442/7296/files/99841958705.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2585/7181/files/michel_houellebecq_les_particules_elementaires.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5795/4464/files/70th_wedding_anniversary_gift_ideas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9133/5593/files/multiplication_tables_2_to_30.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3865/3086/files/netozidabanitekiminijolup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0091/2278/files/miss_stephanie_crawford_gossip.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_off0000624b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624B 4712 bytes
SHA-256: 198080d0f35d17dbc12bd1d3d2a7a46f5dfa8571acb553de2427d74680ebaf93
font_01_sfnt_off0000726f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x726F 10468 bytes
SHA-256: 802a29d613500081bde5ed9184d69c04e82ba0de1cdaeba9dad18a92672bd2f1

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