Malicious PDF — malware analysis report

Static analysis result for SHA-256 545a1cec55024e04…

MALICIOUS

PDF

39.6 KB Created: 2020-08-25 09:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 014201989df0da455a81b90a107ab2c1 SHA-1: b0bfa333f7e6c8e8943ea9e0bc9a3bf1ac24f407 SHA-256: 545a1cec55024e04e37854388401729fc23165b49a37457844a8ed78055760f8
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.cc/pify?keyword=an+introduction+to+sociolinguistics+pdf+janet+holmes'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, many of which are hosted on potentially malicious domains. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the lure.

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=an+introduction+to+sociolinguistics+pdf+janet+holmes
    • http://muwuwejuw.greatandpreciouspromises.org/uploads/1/3/1/4/131407089/riwokarepi.pdf
    • http://sesefupi.wembdon-sunshiners.co.uk/uploads/1/3/0/8/130814297/9874719.pdf
    • http://files.wichcream.com/uploads/1/3/0/7/130775997/gijuvanometapawona.pdf
    • http://files.routesadvisory.com/uploads/1/3/0/7/130739713/daxisan_dunidiga_lunaz_depiwalokakun.pdf
    • https://cdn.shopify.com/s/files/1/0437/5353/7685/files/auto_body_repair_tools.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8795/files/ipvanish_raspberry_pi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4379/9719/files/69939309371.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19252536586.pdf
    • https://cdn.shopify.com/s/files/1/0430/4040/7701/files/4338986619.pdf
    • https://cdn.shopify.com/s/files/1/0440/6027/8936/files/codecademy_html_forms.pdf
    • https://cdn.shopify.com/s/files/1/0435/8907/5102/files/wetovu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9524/5475/files/fenaresupesik.pdf
    • https://cdn.shopify.com/s/files/1/0428/6060/9692/files/81262865647.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/classified_ads_website_template_wordpress_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/7885/2503/files/a_g_noorani_books.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_off00005ce4.bin
b162336204767e844252d9cea4ac56fb3f0448eae5110d56a01bbb90ce2c1148		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE4 5636 bytes
font_01_sfnt_off00006fe4.bin
06fa5bbd3b7cd6e62b1971e49bab7806deec28d75294d40c9f7cdeb402381c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE4 9808 bytes

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