Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fecccf571736ec…

MALICIOUS

PDF

42.9 KB Created: 2020-08-29 23:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1a1576d19c30d546f9032268efd6e8e SHA-1: c0b57ba3b60ce6edaf34c8e0db62548657650651 SHA-256: 41fecccf571736ec9367038b4fe3a50238e73c401092966b841d2f83a7d31855
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a search query for 'thomas the train coloring pages'. This link, https://ttraff.cc/wix?keyword=thomas+the+train+coloring+pages+to+p, is designed to lead users to malicious infrastructure. The document also contains a large number of embedded links to Shopify, likely for SEO manipulation, with one such link being https://cdn.shopify.com/s/files/1/0457/3167/6326/files/acrylic_paint_techniques.pdf. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.cc/wix?keyword=thomas+the+train+coloring+pages+to+p
    • https://cdn.shopify.com/s/files/1/0457/3167/6326/files/acrylic_paint_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/northstar_building_skills_for_the_toefl_ibt_advanced_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/1811/6510/files/88977855490.pdf
    • https://cdn.shopify.com/s/files/1/0434/7897/4616/files/65707402619.pdf
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/29169454532.pdf
    • https://cdn.shopify.com/s/files/1/0429/7120/1695/files/58752170663.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5888/files/direksiyon_seti_oyunlar.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/46349246235.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/minority_scholarship_form_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/6312/2843/files/kurisugoviwumurupe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9048/5150/files/synonyms_worksheet_grade_2.pdf
    • https://cdn.shopify.com/s/files/1/0435/5417/7183/files/71546667561.pdf
    • https://cdn.shopify.com/s/files/1/0430/5544/8213/files/calgary_tourist_map.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2391/files/43234067532.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_off00006b4a.bin
fda606725ec7da0a97a95182ecd4e9edbbbac5c88a098257c6ffc86c1436054e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4A 5296 bytes
font_01_sfnt_off00007d23.bin
915cf69d9af75ad7ac3e1660f1828c81d14f5ec8b07ee50e85cd228abe541223		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D23 9932 bytes

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