Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe87e377ab26c97…

MALICIOUS

PDF

51.3 KB Created: 2020-11-01 06:09:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3b993cee667326cfe025c3fe7bff236 SHA-1: dc0aee40148b60329695192cbfdfc565dbf37f14 SHA-256: 0fe87e377ab26c970d32f1060a7ae0f2dfda79f83f2345855dab3e415fa7add4
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'cctraff.ru'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external PDF links, including one to 's3.amazonaws.com'. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to redirect users to potentially harmful content under the guise of search results or document links.

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/aws?keyword=white+gogo+boots+for+sale
    • https://cdn-cms.f-static.net/uploads/4370088/normal_5f89e478667b2.pdf
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f8be4f0155c1.pdf
    • https://cdn-cms.f-static.net/uploads/4384819/normal_5f9ce778a6847.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tetazino/basic_concepts_of_organic_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0497/1819/8433/files/detodidugigovulekoke.pdf
    • https://s3.amazonaws.com/tetazino/web_development_course_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0496/2392/4885/files/buxade.pdf
    • https://cdn.shopify.com/s/files/1/0433/6173/0718/files/subifoposunupataziso.pdf
    • https://cdn.shopify.com/s/files/1/0486/4114/7038/files/32353479133.pdf
    • https://cdn.shopify.com/s/files/1/0266/8544/0170/files/map_test_scores_chart_percentile.pdf
    • https://uploads.strikinglycdn.com/files/1a7e27d4-01d7-496c-bcb4-07cfed7a974b/lopemojuv.pdf
    • https://cdn.shopify.com/s/files/1/0441/2502/8504/files/keter_230_gallon_deck_box_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0502/9170/3963/files/honeywell_pro_5000_digital_thermostat_manual.pdf
    • https://uploads.strikinglycdn.com/files/d6bf9679-e6a6-42d2-a30e-cc311d3b3279/bufos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d6c.bin
4d6613af7ad3991a8822ad414f9669f105109d5111cd20b31635bebff965c123		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D6C 4864 bytes
font_01_sfnt_off00008e13.bin
cd32ec8ec77a83d75a6c599bbf152af5c74eb35d0d35605bbfb7785bd538efd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E13 10656 bytes
font_02_sfnt_off0000b26d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB26D 4324 bytes

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