Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb01bf93cdf45bc…

MALICIOUS

PDF

48.9 KB Created: 2020-07-30 23:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d3f1df5f7fd247f231b4edea837d042 SHA-1: bf90043840ef234e6a6486e954d905decad079e6 SHA-256: efb01bf93cdf45bc70b37846fb2d495be951493cf8251ab221c26aafc3ebe1a5
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. It also exhibits characteristics of a PDF SEO link farm, with numerous links to external PDFs, including one hosted on Shopify. The document body, though heavily obfuscated, contains the text 'Gramatica de uso pdf vk', suggesting a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL.

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/wb?keyword=gramatica%20de%20uso%20pdf%20vk
    • http://files.carlystong.com/uploads/1/3/1/3/131379971/xotimulewabi.pdf
    • http://files.5dmarketingandconsulting.com/uploads/1/3/0/9/130969986/58a76e30b7366.pdf
    • http://files.katjasymons.com/uploads/1/3/2/7/132740260/3758946.pdf
    • http://files.genehamiltonartist.com/uploads/1/3/1/4/131437457/togirowida.pdf
    • https://cdn.shopify.com/s/files/1/0433/3332/0872/files/pabij.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0413/files/petetizujekowelenatig.pdf
    • https://cdn.shopify.com/s/files/1/0433/1572/4456/files/batavogezobimuvamutijiko.pdf
    • https://cdn.shopify.com/s/files/1/0435/0266/5892/files/mubamapo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3962/9218/files/jujezidir.pdf
    • https://cdn.shopify.com/s/files/1/0435/5378/3957/files/luxekuvoku.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/tesujidak.pdf
    • https://cdn.shopify.com/s/files/1/0435/6587/5359/files/64738494980.pdf
    • https://cdn.shopify.com/s/files/1/0433/1628/1512/files/30337149947.pdf
    • https://cdn.shopify.com/s/files/1/0429/9427/0371/files/fusaxusuraguvadosigezom.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_off00007343.bin
33b4a7aa6ca9cf1b936954e67e137281c959c905d6aabd48048ac6ff35e9d439		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7343 5200 bytes
font_01_sfnt_off00008503.bin
d2280f268b23a17ed2b397bc08abbb98992cc0ec451d46b8afaa9106d99e624e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8503 15492 bytes

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