Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef1837e84d668be…

MALICIOUS

PDF

41.0 KB Created: 2020-08-25 17:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8ef2a799a9e208e96c3e780b0d889ee SHA-1: 82f39d77545ea1b6ddbcd4a399940c9ecf44f317 SHA-256: 9ef1837e84d668bed55ea61ab321f16c62426f0e535a1a5eff14ce8da0d55724
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to direct users to a malicious redirector at `https://ttraff.cc/pify?keyword=bowflex+xtreme+2+exercises+pdf`. This redirector is likely used to deliver a secondary payload or lead the user to a phishing page. The document body, though heavily obfuscated, contains references to the redirector URL and numerous benign-looking PDF links hosted on Shopify, likely to improve search engine ranking and mask the malicious intent. The ML classifier strongly supports the malicious verdict.

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=bowflex+xtreme+2+exercises+pdf
    • http://files.skinsugarrx.com/uploads/1/3/1/3/131379443/vekolevekodisirut.pdf
    • https://cdn.shopify.com/s/files/1/0440/9750/3384/files/37973412790.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3304/files/42568441472.pdf
    • https://cdn.shopify.com/s/files/1/0435/4555/9189/files/calibre_android_client.pdf
    • https://cdn.shopify.com/s/files/1/0434/2090/9735/files/govekopebepaza.pdf
    • https://cdn.shopify.com/s/files/1/0444/0922/5382/files/amu_b_tech_entrance_syllabus_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5534/0954/files/data_structures_and_algorithms_tutorial_tutorialspoint.pdf
    • https://cdn.shopify.com/s/files/1/0428/6103/5686/files/rizikowabi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1583/0695/files/kofogukomiw.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_off00005931.bin
47c2dd5e8eff6cec72bf33efff9739c7db699d526edb1faa4fc9a302db27a746		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5931 5432 bytes
font_01_sfnt_off00006bb6.bin
15d3344cd902915ff1e962b6bf78852af3f0e38204459e66e63b9579feca23b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB6 13996 bytes

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