Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d786471c5faa7c…

MALICIOUS

PDF

44.5 KB Created: 2020-07-08 21:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4696a68b6c335bb18082e853b6027a7d SHA-1: 027e0f75c67849971aecda280b82de2894a80cd1 SHA-256: a1d786471c5faa7ca5c60357faa9ba1cb851bcb473b4a67477210c22326c0cfd
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

This PDF document contains a large number of embedded links, characteristic of a link farm designed to manipulate search engine results or distribute malicious content. One of the primary links, 'https://ttraff.ru/wb?keyword=5th%20grade%20math%20coordinate%20grid%20worksheets', points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and other PDF links, reinforcing the malicious intent. The file was generated by wkhtmltopdf, a tool often abused for creating such link farms.

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/wb?keyword=5th%20grade%20math%20coordinate%20grid%20worksheets
    • http://files.skippingnt.com.au/uploads/1/3/0/9/130969775/limavagupovez_dinevigavaxox_natatalowaxo.pdf
    • http://files.thegirlsfromguantanamo.com/uploads/1/3/2/6/132681938/2217839fd6588e.pdf
    • http://files.estellessweetitchblankets.com/uploads/1/3/1/4/131409170/tixavaxanepuluxuvit.pdf
    • http://files.businessbcs.com/uploads/1/3/2/7/132740343/e9c81eaa854.pdf
    • http://files.kcpanhel.com/uploads/1/3/2/8/132815961/1055807.pdf
    • http://files.rowdyrogers.com/uploads/1/3/2/8/132814239/8027949.pdf
    • http://files.carolinastormhedgehogs.com/uploads/1/3/1/6/131637291/fanipewonosewagafuv.pdf
    • http://files.evelandfarm.com/uploads/1/3/1/4/131436971/93088aafe1eb3.pdf
    • http://files.binnyliu.com/uploads/1/3/0/7/130740493/wujetevelumila.pdf
    • http://files.emeraldtreeexperts.net/uploads/1/3/0/9/130969427/6706914.pdf
    • http://files.savebozeman.org/uploads/1/3/1/4/131408529/80336d.pdf
    • http://files.jorjahudsonportfolio.com/uploads/1/3/1/8/131872048/4151772.pdf
    • https://jararevus.files.wordpress.com/2020/06/zabewofikoxa.pdf
    • https://pixaxaxaluz585082879.files.wordpress.com/2020/06/lovigugijakiwivufiberonu.pdf
    • https://wefozeb.files.wordpress.com/2020/06/45676075612.pdf
    • https://giwogixud.files.wordpress.com/2020/06/8094999636.pdf
    • https://dokuwedefef.files.wordpress.com/2020/07/tezenonurezen.pdf
    • https://rakatifi.files.wordpress.com/2020/06/18056963446.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86593634255.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76957488457.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mosagewenusuwaguxizekud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejukimuvili.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/titigabibuzumazavuxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gobobuxewinunegurugita.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_off00007079.bin
350cc658de25fe671ab989982c7153d747b4aeac9f88706712519118fec05b56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7079 5296 bytes
font_01_sfnt_off00008262.bin
dfda66428d7efbe070bb0e25734d4b1cf9eff75fe96f1e2d241f1fa3ae7e6f9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8262 9992 bytes

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