Malicious PDF — malware analysis report

Static analysis result for SHA-256 c497619fa25e46fa…

MALICIOUS

PDF

56.3 KB Created: 2020-08-18 18:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af43544e7f3b3a944dd3946ef071f630 SHA-1: 847ef7f95ecea80242fc9a608c93708d503c2df9 SHA-256: c497619fa25e46face9892f37d0b79b103baf7454eeda0c2cd8b07122502c3be
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=sandwich+theorem+calculus+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to obscure the malicious redirector. 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.ru/pify?keyword=sandwich+theorem+calculus+pdf
    • http://files.rocio-madera.com/uploads/1/3/2/6/132681342/4395982.pdf
    • http://files.feathersinthestream.com/uploads/1/3/1/4/131483148/6864300.pdf
    • http://pamuk.edwinagustafson.com/uploads/1/3/1/8/131858540/3db287f204da.pdf
    • http://bobarek.unscriptedfest.com/uploads/1/3/1/3/131398473/4535173.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0295/files/xulirupaxaziwumewito.pdf
    • https://cdn.shopify.com/s/files/1/0446/1314/0643/files/robinhood_python_api.pdf
    • https://cdn.shopify.com/s/files/1/0438/1245/4557/files/22271950460.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/34783623353.pdf
    • https://cdn.shopify.com/s/files/1/0438/0088/7457/files/beedi_scholarship_form_2020_18.pdf
    • https://cdn.shopify.com/s/files/1/0430/6668/7639/files/77567512606.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/kiss_the_rain_sheet_music_piano.pdf
    • https://cdn.shopify.com/s/files/1/0437/1637/8773/files/barron_s_sat_practice_tests.pdf
    • https://cdn.shopify.com/s/files/1/0437/5104/7329/files/94076473343.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000771e.bin
fd3487ff0283e1352137248f90995a027133d062ed24156eed24e11a749f8710		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771E 5588 bytes
font_01_sfnt_off000089fa.bin
82faa53ac27e6dc303e502fe81dd0ead1b86ab2fa965228cadad7602e77fc129		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89FA 16648 bytes
font_02_sfnt_off0000be69.bin
ff9b4e7a25d0f1861695234b11a1f9dea8cc33768ea8c2904995884924116764		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE69 16280 bytes

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