Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d156f8e99d62754…

MALICIOUS

PDF

41.1 KB Created: 2020-10-17 17:39:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e124f66472ba5ec3d7e44c6d5e2f4cdd SHA-1: 6ed73152eadc10c54a897da171930aa62f1ba3c5 SHA-256: 7d156f8e99d6275461f35ce93150a36e01d3c242df56d3b06c693905dd6a515f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, directing users to potentially malicious infrastructure. One such URL, https://cctraff.ru/strik?keyword=exercicios+sistema+locomotor+8+ano+doc, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to these URLs, suggesting an attempt to lure users to external sites for further exploitation. No scripts were extracted, but the PDF structure itself facilitates the attack.

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=exercicios+sistema+locomotor+8+ano+doc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370525/normal_5f8acd95acf13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370090/normal_5f8847034bd87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f880f53244eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_5f8819cf97539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5f885205671f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f878df5ec095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f878fe06522c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_5f884925f2e25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f87ed7377bba.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/19e0cb9d-c832-4284-b01c-dd0fba0a1bc4/kowolije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0012a154-b37c-4645-831a-c48602ac454d/baxogalili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f38df24e-6237-47e6-b8e2-ff5197f82b10/77617171737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac588d0d-c7f2-4137-891c-e70552df6be6/70012157388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dbdcc99-98fd-42a7-9c02-af74ae1441c0/tikodiposikegurili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3206dd02-9964-4d42-8a65-0d7859132e25/gabajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/934c9436-8258-4165-bc51-85d4b6c24353/zazikomovivopagomutuvodaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/296c7fd8-5f90-459a-9c20-532177201556/97348615041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad6585d-69df-4eb5-9a2f-183b91d86dc9/rikufubulevedama.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0513/0944/files/support_the_apa_ptsd_treatment_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/wesodisodagidiguv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/9366/8255/files/new_cosmetics_brands_2015.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2392/6949/files/xajalen.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_off0000627f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627F 5304 bytes
SHA-256: 30318b0d3715624bcae8b72d2debf6f843f5759ae59402b8a6cdc199ceb969aa
font_01_sfnt_off00007469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7469 10228 bytes
SHA-256: c9aba5edf69b2c3e54e678c413959d3e7c677551da398a8e5f3c2ab4f54f7c4e

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