Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e659e0b2b350f3…

MALICIOUS

PDF

40.8 KB Created: 2020-08-03 20:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0636e609c9a4b01337a6ca53c7da72e9 SHA-1: 68ff876875889ac190b0b66ef5814aff3c300647 SHA-256: 35e659e0b2b350f3747f191ebb0244c7a878e85dbe642628052b9ecffda0b63b
150 Risk Score

Malware Insights

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

The PDF document exhibits malicious behavior through a large number of embedded links, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The primary malicious URL identified is https://ttraff.com/pify?keyword=curso+robotica+pdf, which likely serves as a redirector. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the same malicious URL and a large number of Shopify-hosted PDF links, suggesting a link farm or redirection strategy.

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.com/pify?keyword=curso+robotica+pdf
    • http://pagigex.tcslonaker.com/uploads/1/3/1/8/131872225/fazewobikosa_xojexalovizu_selas.pdf
    • http://files.irinakhromova.com/uploads/1/3/1/4/131406715/1499679.pdf
    • http://files.5starstreams.com/uploads/1/3/2/7/132741109/4e9dc78675237c.pdf
    • http://files.westport.votersguide.info/uploads/1/3/0/8/130873872/5732686.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7407/files/91950152688.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/22370508761.pdf
    • https://cdn.shopify.com/s/files/1/0428/0988/4838/files/nafiwuwipubupiluwup.pdf
    • https://cdn.shopify.com/s/files/1/0438/3178/7670/files/57846615561.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/bizituvetisunuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/67521119669.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6088/files/anime_guy_crying.pdf
    • https://cdn.shopify.com/s/files/1/0434/2336/7335/files/samknows_whitebox_hack.pdf
    • https://cdn.shopify.com/s/files/1/0428/2223/8374/files/lasifalapikepunetelaxakug.pdf
    • https://cdn.shopify.com/s/files/1/0437/3633/4501/files/datikaduriru.pdf
    • https://cdn.shopify.com/s/files/1/0432/2705/4237/files/vubuzodarugaseziwux.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_off00006146.bin
4707c5e18aac8d770c1dc1da57c1951bda700e9a9a17fd3e8068bc433b7784b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6146 5160 bytes
font_01_sfnt_off000072d7.bin
91d0facffc733a27567be9b0b16df559c8331a76ce790ff39d4eaef7b713c0ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D7 10464 bytes

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