Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee0bbd5135d2997…

MALICIOUS

PDF

47.4 KB Created: 2020-08-05 15:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae3d4878ca9fc60d843fecb586d3d6c1 SHA-1: 20cae775e4791a7ddba97f2407906e19f0d48397 SHA-256: 8ee0bbd5135d29976877227bb7a265c74a712b16e78b42b24dd9ca284870d610
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting a lure for users to click on a link disguised as a physiotherapy treatment PDF. The ML classifier also strongly indicated maliciousness.

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=carpal+tunnel+syndrome+physiotherapy+treatment+pdf
    • http://files.ccevenice.com/uploads/1/3/1/0/131070291/ccf226.pdf
    • http://files.lyndalriley.com/uploads/1/3/1/6/131637498/8167253.pdf
    • http://files.friendsofrothrock.org/uploads/1/3/1/8/131871864/cf04d2044508829.pdf
    • https://cdn.shopify.com/s/files/1/0430/9316/4199/files/wofuvekosotokewifavafilon.pdf
    • https://cdn.shopify.com/s/files/1/0434/2608/7064/files/luvakupavesulujokenol.pdf
    • https://cdn.shopify.com/s/files/1/0430/6354/1917/files/ginanim.pdf
    • https://cdn.shopify.com/s/files/1/0433/5301/4423/files/borulamutilabonunuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/64188605722.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/46633727128.pdf
    • https://cdn.shopify.com/s/files/1/0433/4449/4760/files/leadership_styles_journal_articles.pdf
    • https://cdn.shopify.com/s/files/1/0434/4607/5542/files/vujagukavamowi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3156/files/57680709238.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9273/files/inorganic_growth_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0431/1921/4756/files/87431281752.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/tewizisijoparalunovafidex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9950/5311/files/4048616869.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/zozifi.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_off00007b97.bin
b834f8f4ff66498fee629c99299eddf04f55937d1667b09a631a2311c1e37a8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B97 5288 bytes
font_01_sfnt_off00008d6a.bin
83a0df7f83abf12d044baed958dc6b124610e32ec101264c73248b003c76b7de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D6A 10088 bytes

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