Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ac301be4027b1a…

MALICIOUS

PDF

44.5 KB Created: 2020-08-18 21:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75a877c525cc0f577f8ffd5eac6dcefe SHA-1: bb1191b62c7519e58129891aa0af19ba30093f8f SHA-256: e4ac301be4027b1a86138237e456e55c90f8821828bc5ca67dad78cfba105d40
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large external PDF link farm, suggesting an attempt to manipulate search engine results or distribute content. The primary malicious URL identified is https://ttraff.ru/pify?keyword=artr%25C3%25B3podos+definicion+pdf, which is flagged as a malicious redirector. The document body itself is heavily obfuscated and contains metadata from wkhtmltopdf, indicating it was likely generated programmatically.

Heuristics 3

  • 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.
  • 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://ttraff.ru/pify?keyword=artr%25C3%25B3podos+definicion+pdf
    • http://files.kayandthechaos.com/uploads/1/3/1/3/131380754/f88329b.pdf
    • http://pakav.westcountryhearthattack.com/uploads/1/3/2/6/132695535/warimogovokivuv_sowegabef_pobuvolo_bezuwudaj.pdf
    • https://cdn.shopify.com/s/files/1/0427/8163/8812/files/formato_de_certificado_medico_cruz_roja.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3504/files/20164377480.pdf
    • https://cdn.shopify.com/s/files/1/0434/2035/2677/files/86970459281.pdf
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/towovimejobinure.pdf
    • https://cdn.shopify.com/s/files/1/0431/5483/3557/files/dorinimojejekemakasun.pdf
    • https://cdn.shopify.com/s/files/1/0434/2353/1175/files/naxenifapusopu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0655/files/42740436627.pdf
    • https://cdn.shopify.com/s/files/1/0431/8088/4129/files/74430891542.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/xekabenosipixipawisajebep.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/fufopipiwo.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068f4.bin
50a56910e354bb5025f147d2416e90f659dcd0f1e542e2c0491488790ccc620a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F4 5032 bytes
font_01_sfnt_off000079eb.bin
3cf2f33a457c2497bd810803095763193c2fe0f2de4007f324128b0ff63b16b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79EB 13200 bytes

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