Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bef7faa237e2d40…

MALICIOUS

PDF

39.8 KB Created: 2020-08-30 23:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91fb938136f71e4011290aa82676816d SHA-1: cb3540ba6cfee5972bf07acef1bac006f0c2a0e7 SHA-256: 3bef7faa237e2d4074bcedb9d89ee37d101cd315e166139c6fca71edb3937602
120 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one prominently pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'Kindergarten science and social stud' and the malicious URL, suggesting a lure to disguise the malicious intent. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the presence of a link to malicious infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, with the primary one being to a Shopify domain, likely an attempt to appear legitimate.

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/wix?keyword=kindergarten+science+and+social+stud
    • https://cdn.shopify.com/s/files/1/0431/6617/1296/files/38613370099.pdf
    • https://cdn.shopify.com/s/files/1/0430/9961/9492/files/cognitive_approach_to_language_learning.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nazowexoratusitufunu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/fojofafisagixa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/guvut.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ba32c53e07e478bb5d9789dcc64f4a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_f451dc816fca4411af055875a0af53e9.pdf
    • https://static.usrfiles.com/ugd/9ea91e_25fa6308dca54352a7b18833920d2a17.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c28722ba0fb4ef7952034c59dc9e030.pdf
    • https://static.usrfiles.com/ugd/8e1900_1595125bd63041ab81e4fc4ede50fbfd.pdf
    • https://static.usrfiles.com/ugd/067ecb_e3651e4b8a4b4e96b8d9c102a0439eb0.pdf
    • https://cdn.shopify.com/s/files/1/0434/2870/8519/files/loxixanumuxepefe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ranugebiwuzejivuzuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2593/files/85272284208.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_off00005ece.bin
7d6fcc2485df9d9889eb55e0ab62fe829ef1e92c467e8132f0460da2c1847a4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECE 5076 bytes
font_01_sfnt_off00007013.bin
f3c5025a31f805f2cacae4d5986bf525a38afe21a19acf46be92a71aa79eaf50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7013 10132 bytes

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