Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dc69c96d7bd68f2…

MALICIOUS

PDF

47.1 KB Created: 2020-08-23 15:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf0fd5e2ec77d138d95b5bb1db2fd035 SHA-1: b77e6b25d9ad7e83408947df4e96be1c45b8d2be SHA-256: 2dc69c96d7bd68f2e6461535991e622e33e4355f7002c9d2fd22748286ce6817
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'face mask sheets' and the malicious URL, suggesting a lure to a phishing or scam page. The ML classifier strongly indicates maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a malicious URL.

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=face+mask+sheets+for+dry+skin
    • http://nojasekak.kncperformingartscompany.com/uploads/1/3/1/4/131437208/woduliluteja.pdf
    • http://files.southernalbertabowhuntersassociation.com/uploads/1/3/2/6/132695428/40e6b0.pdf
    • http://rajikas.gffmi.org/uploads/1/3/0/7/130740072/674ca0938.pdf
    • http://lamaxi.wrangellsda.org/uploads/1/3/2/6/132683292/81d2d854a87886f.pdf
    • https://cdn.shopify.com/s/files/1/0437/8948/4190/files/human_biology_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0438/1098/0000/files/son_chiraiya_full_movie_720p_filmywap.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/lubob.pdf
    • https://cdn.shopify.com/s/files/1/0431/5221/2130/files/web_to_chrome_plugin.pdf
    • https://cdn.shopify.com/s/files/1/0433/8571/6886/files/font_cavorting_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/8140/0469/files/megefoki.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7914/files/java_design_patterns_tutorials_point.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2250/files/most_important_full_forms.pdf
    • https://cdn.shopify.com/s/files/1/0436/8426/6137/files/liwolisalimenegaxum.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_off00007ae4.bin
d9d24e53df6b578b282f402eff28e8b4b1e2bd6c3900a4b07d90d3fb6229e47b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE4 5352 bytes
font_01_sfnt_off00008cfc.bin
5ef429cc1da27e7180b9ceea63e80999e76c1eb6805c52b2d645eb25baf02262		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFC 10156 bytes

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