Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e1c695a522862d6…

MALICIOUS

PDF

56.8 KB Created: 2020-10-17 17:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4dfcb506b9406495f567e9449e1a1ac5 SHA-1: 8062be114c68049d09278b855d8cb1ac00733bd6 SHA-256: 0e1c695a522862d6bdda4d1ce056063afa97444a3fd50954b4d35ffb6994cad0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?keyword=comentario+mapa+unidades+morfoestructurales+de+espa%25C3%25B1a'. Additionally, it features a large number of external PDF links, suggesting a link farm or SEO abuse tactic. The ML classifier also strongly flagged this PDF as malicious.

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=comentario+mapa+unidades+morfoestructurales+de+espa%25C3%25B1a In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5f8ad01780097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375073/normal_5f89bb6d4e024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378848/normal_5f8a64fcc0e11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5f88994a72b62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_5f878c5e5dfc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f8919cbb9f19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f88a2f578bcf.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/1/0500/2893/7385/files/87980878274.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6227/1898/files/carlson_school_of_management_ranking.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8361/5394/files/99249143994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/5277/6603/files/23716723535.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9793/9861/files/zeks_air_dryer_parts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0377/2583/files/rotexivotukufubazonoreso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3589/7251/files/jakedabutajuje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6558/0437/files/71856720296.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/1970/5761/files/9397476317.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0320/3751/files/79678001478.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/8189/2508/files/pazovumazixebur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5181/0969/files/legacy_of_discord_furious_wings_br_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80E0 5416 bytes
SHA-256: 08d6aff681e2ca0256ef364fe268f734a7d0413d0602576b9edc6a853d2bc5be
font_01_sfnt_off000092e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92E9 11032 bytes
SHA-256: a74d91f0041bffd23a0e79d7258ec56bef93886e51a8e7a4f70b24050f0b3d0c
font_02_sfnt_off0000b6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FE 18076 bytes
SHA-256: 72a5af4a2192993d891ede2e11204a739fc97aac63956fbd79a5c90d204be0a6

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