Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c993b29ba3e973…

MALICIOUS

PDF

53.2 KB Created: 2020-08-24 05:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cc9b5dcc4c48aac97baaf5b4ad13515 SHA-1: 3844d16e4dce3257570d07bba6f615f336f3d587 SHA-256: 23c993b29ba3e97381e1697f11df385fd32ad6f502c06d0e956504bd28aeec4b
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of embedded links, indicative of an SEO link farm. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword suggesting a potential lure. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but also includes the suspicious URL and metadata suggesting it was generated by wkhtmltopdf.

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=coliform+species+in+urine
    • http://files.naturalhealthyoga.com/uploads/1/3/1/8/131871390/552867.pdf
    • https://cdn.shopify.com/s/files/1/0428/6650/7943/files/jifuwiwozanumatizi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5892/0605/files/menewinuvizakat.pdf
    • https://cdn.shopify.com/s/files/1/0438/0000/2717/files/importance_of_affective_domain.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8983/files/famotugorugipajofileraf.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0811/files/vejobaxivifoz.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/201823564.pdf
    • https://cdn.shopify.com/s/files/1/0432/7076/6750/files/fesezixojifep.pdf
    • https://cdn.shopify.com/s/files/1/0438/1887/7090/files/19711614660.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/35460464243.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1880/files/zolavolotij.pdf
    • https://cdn.shopify.com/s/files/1/0432/7414/1864/files/jumaluramelimemoguruf.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_off00008c2e.bin
54da552c112a9a6d5f93e394636ad0c4743d7d153e1ff8f55442f463caabd7d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2E 4856 bytes
font_01_sfnt_off00009ca0.bin
961b371e41fc6851c7cf9487bebfbf48f399a3e54bca3ef547c30429e4fa5e8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CA0 13784 bytes

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