Malicious PDF — malware analysis report

Static analysis result for SHA-256 237bfe72605513d6…

MALICIOUS

PDF

33.3 KB Created: 2020-08-20 00:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b10edee348119274149235bf8eeaf47e SHA-1: da138ad54695866f6bb269f9ee60aca78f992000 SHA-256: 237bfe72605513d6c732dfe626d228fc978e5b759439c7b17272f72ca65644ba
150 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Shopify-hosted PDFs, which is characteristic of a link farm designed to manipulate search engine rankings or lure users. One of the primary links, 'https://ttraff.ru/pify?keyword=test+item+analysis+deped+template', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, further supporting the malicious intent.

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=test+item+analysis+deped+template
    • http://files.tangiermun.org/uploads/1/3/1/6/131637606/viwuzagir_sijiwodudeka_tebirokure_kafubojenor.pdf
    • http://files.drboydthechemist.com/uploads/1/3/1/4/131406649/aff9135d5f7.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kofuka.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8077/files/7158376749.pdf
    • https://cdn.shopify.com/s/files/1/0437/8873/0525/files/xawanijowinuxenaveruz.pdf
    • https://cdn.shopify.com/s/files/1/0438/0341/0589/files/conduction_heat_transfer_arpaci.pdf
    • https://cdn.shopify.com/s/files/1/0445/7860/3167/files/kolorobuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/4517/4939/files/2482674842.pdf
    • https://cdn.shopify.com/s/files/1/0433/6628/5464/files/58430359383.pdf
    • https://cdn.shopify.com/s/files/1/0432/5172/8546/files/28466831543.pdf
    • https://cdn.shopify.com/s/files/1/0428/5153/2963/files/fugivejonowujo.pdf
    • https://cdn.shopify.com/s/files/1/0440/5959/0806/files/gauhati_university_bsc_botany_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0431/7829/5450/files/laxafatuzugotavewuten.pdf
    • https://cdn.shopify.com/s/files/1/0428/6690/1148/files/76022974852.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_off000045ef.bin
a24b3a9dd635acae8b310985917e7e2d86f1261679927ce3c99c2e5b9b922009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45EF 5060 bytes
font_01_sfnt_off00005714.bin
fcf805f7abd5ed98f797600fea85fd66456e4dd7ed4df31db86a31840f2d823c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5714 9884 bytes

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