Malicious PDF — malware analysis report

Static analysis result for SHA-256 451b58d5f0335fe7…

MALICIOUS

PDF

35.5 KB Created: 2020-08-06 08:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b67f3ad325b0247cddb36dfb1713333 SHA-1: 7be892ef23e611cf913b55b81d0567ec7f85e744 SHA-256: 451b58d5f0335fe7eb6167cc3892e6bf92b8a9fdb959986b4e89839c6f21d345
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.ru/pify?keyword=modern+auditing+and+assurance+services+6th+edition+pdf+download', is designed to lead users to malicious infrastructure. The document also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to various external resources, many of which are hosted on Shopify. The ML classifier strongly supports the malicious nature of this PDF.

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=modern+auditing+and+assurance+services+6th+edition+pdf+download
    • http://files.karamadental.com/uploads/1/3/1/0/131071041/tofijaxakanip_bogureg_vuzosexeket_fovidepopuw.pdf
    • http://files.nicolenaro.org/uploads/1/3/2/6/132683260/beveniveramarilafu.pdf
    • http://files.hisinscriptions.com/uploads/1/3/1/6/131637240/076b415c.pdf
    • http://files.ironboyexperience.com/uploads/1/3/0/7/130738903/8110990.pdf
    • https://cdn.shopify.com/s/files/1/0437/2240/8087/files/new_years_eve_houston_2016.pdf
    • https://cdn.shopify.com/s/files/1/0434/5253/0845/files/xixafizikesidawazalil.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/92588999912.pdf
    • https://cdn.shopify.com/s/files/1/0432/3521/3467/files/tokikusezexisefekomiweb.pdf
    • https://cdn.shopify.com/s/files/1/0432/6011/7160/files/9980296985.pdf
    • https://cdn.shopify.com/s/files/1/0428/8351/4527/files/21770225159.pdf
    • https://cdn.shopify.com/s/files/1/0440/4045/4294/files/nanurametaselemegilex.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6335/files/tisewixa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6157/files/7206110877.pdf
    • https://cdn.shopify.com/s/files/1/0440/9376/7832/files/office_365_administration_guide_enterprise.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_off00004918.bin
67447a8a1f583372d56262ecea9b214558bbb77b70ea078169bd034437cbd785		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4918 5728 bytes
font_01_sfnt_off00005cbe.bin
e92311f0f9b504d7ed191cb359dad9b0e7dce0450bf8098c7b08ec3e4ff9c7e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CBE 10844 bytes

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