Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c26d82e009f31a…

MALICIOUS

PDF

40.1 KB Created: 2020-08-16 15:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bab71867404c23d25e28a58722a7b417 SHA-1: 7e3b5091e223908d479bacbd7257b89ba74ee162 SHA-256: 82c26d82e009f31a1147bc02e73c51861f9e66918e9ddeb807ef48a0e7dbb414
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, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=bisphosphonate+osteoporosis+guidelines', is designed to redirect users to malicious infrastructure. The PDF also exhibits characteristics of a link farm, with numerous embedded links to other PDFs, many hosted on Shopify. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=bisphosphonate+osteoporosis+guidelines
    • http://kuxijuj.frigatebirdfishing.com/uploads/1/3/0/8/130813528/bemab_wusomotelazadef_rimavonu.pdf
    • http://wetuvosef.meganhensonphotography.com/uploads/1/3/1/8/131856161/nixomiwotus.pdf
    • https://cdn.shopify.com/s/files/1/0438/1884/4322/files/56508324778.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/xexokaxekewosepalexarit.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/auto_repair_shop_invoice_template.pdf
    • https://cdn.shopify.com/s/files/1/0440/5726/4280/files/fusononebanogepuninenuse.pdf
    • https://cdn.shopify.com/s/files/1/0429/2483/4975/files/zupenofo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3903/8359/files/absorcion_atomica_de_llama.pdf
    • https://cdn.shopify.com/s/files/1/0432/3776/9384/files/beavers_bend_fly_shop.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6845/files/31757678386.pdf
    • https://cdn.shopify.com/s/files/1/0431/6332/0469/files/signature_line_in_word.pdf
    • https://cdn.shopify.com/s/files/1/0432/9675/1774/files/degerenejefisos.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9560/files/hiscox_baptist_manual.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_off00005f79.bin
ae5d147f924e18e6d65b094d2832dd4903bedd1584e138251727b6b2ff08158f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F79 5272 bytes
font_01_sfnt_off0000714c.bin
7e72956b67578cdf93e8c85e9033ea2e2043fee9129c141c2bc5a469aaa25b55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x714C 9960 bytes

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