Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e896605e5abaafc…

MALICIOUS

PDF

49.5 KB Created: 2020-09-08 17:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a17b8d4277cd5aa7d7a584731586ca4 SHA-1: 552f1cfc7fcf7314c97e33e1cdc7c1b976d10b52 SHA-256: 3e896605e5abaafc576cec3844c0049042d22d79510430b129d4cc89d5757ab9
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=spina+bifida+chiari+malformation'. The document body, though partially corrupted, also contains this URL and other benign-looking PDF links, suggesting a lure to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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.link/wix?keyword=spina+bifida+chiari+malformation
    • https://static.usrfiles.com/ugd/f96b02_05bde49fc28f4f869f776b5c4cf132a2.pdf
    • https://static.usrfiles.com/ugd/c268f7_1e1060a8fd584714952d4b11ddbe38fb.pdf
    • https://static.usrfiles.com/ugd/682d1c_de77477f3a8e4c40a21e3164f7d81704.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8104/files/project_mass_day_2.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/equation_of_a_circle_given_3_points.pdf
    • https://cdn.shopify.com/s/files/1/0437/6123/8168/files/60714665988.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/contact_us_page_template_bootstrap.pdf
    • https://cdn.shopify.com/s/files/1/0432/0709/8529/files/reporte_trafico_autopista_mexico_queretaro.pdf
    • https://cdn.shopify.com/s/files/1/0432/5684/0350/files/88155740779.pdf
    • https://cdn.shopify.com/s/files/1/0434/8418/4728/files/87770858404.pdf
    • https://cdn.shopify.com/s/files/1/0437/4868/8033/files/podol.pdf
    • https://cdn.shopify.com/s/files/1/0429/4764/1510/files/funding_for_small_business_startup.pdf
    • https://cdn.shopify.com/s/files/1/0432/8043/3302/files/12931478439.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_off0000836c.bin
26eea7a042eb6ec8afa4da3b6a9be927951cdbe72f03ff1bdfd6a0c30dd42c93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x836C 5460 bytes
font_01_sfnt_off000095d1.bin
ea291e5e7bed43987a5237cb19768e887643569e03d94e668fc2a309ac8e9687		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95D1 10296 bytes

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