Malicious PDF — malware analysis report

Static analysis result for SHA-256 8533db8cbedf55b2…

MALICIOUS

PDF

43.7 KB Created: 2020-08-01 19:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a09a2ce524fafad74d3d08fecf06a4f3 SHA-1: c407fc68a1b2761b54246ec17b26ea88b87af3c5 SHA-256: 8533db8cbedf55b2d94d30d2117d94776effbc75a9b26b0f60f1a9316f624c07
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, forming a link farm. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=what+happens+at+an+engagement+party'. This suggests the document is designed to lure users into clicking malicious links, likely for phishing or to download further malware. No scripts were extracted from this sample.

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=what+happens+at+an+engagement+party
    • http://files.vermontventure.com/uploads/1/3/2/6/132681219/437369.pdf
    • http://files.trapwingfestival.com/uploads/1/3/1/4/131408970/kitirefonug.pdf
    • http://files.inbetweentheories.com/uploads/1/3/0/7/130775475/zodolat.pdf
    • http://files.neuroactiveexercise.com/uploads/1/3/1/4/131413550/d2814f.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/8388829489.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3934/files/vasesen.pdf
    • https://cdn.shopify.com/s/files/1/0436/1319/2349/files/25443929651.pdf
    • https://cdn.shopify.com/s/files/1/0435/3658/0757/files/99176182857.pdf
    • https://cdn.shopify.com/s/files/1/0428/7604/3423/files/74587447829.pdf
    • https://cdn.shopify.com/s/files/1/0437/4760/6679/files/pip_install_not_working_mac.pdf
    • https://cdn.shopify.com/s/files/1/0439/2858/4347/files/51112067481.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/votekiviju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kexuxedixu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7621/files/bufebowesadirajemupiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/2712/8735/files/jimifopufe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7381/files/dedejuku.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_off00006da5.bin
1ccf4c400b91656d7bf0710d0af614cbf3d0ff1849e4a619e155918a572d0755		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA5 5316 bytes
font_01_sfnt_off00007fa1.bin
dc048ee97711d823c8a635516e51032611b5f1645e713b97c2f1260e9758d97a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA1 9996 bytes

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