Malicious PDF — malware analysis report

Static analysis result for SHA-256 499f792f779bb3c3…

MALICIOUS

PDF

44.2 KB Created: 2020-08-31 06:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8552ff465d96e4f8d523f243f1060f1f SHA-1: bdcf049c391e499bf863deb1d15452e2612e900d SHA-256: 499f792f779bb3c363a9e268487c40e875aed0e7b95faa646490aea78bbe05b0
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=codigo+de+colores+de+resistores'. This URL is presented within the document body, disguised as information about resistor color codes, to entice users to click. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to Shopify domains, likely for SEO manipulation or to host further malicious content. No scripts were extracted, and the document body is heavily obfuscated, but the primary intent appears to be directing users to the malicious redirector.

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=codigo+de+colores+de+resistores
    • https://cdn.shopify.com/s/files/1/0429/5199/9637/files/15153083325.pdf
    • https://cdn.shopify.com/s/files/1/0430/1013/0073/files/tuveromibitu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6536/0034/files/73940570183.pdf
    • https://cdn.shopify.com/s/files/1/0429/1156/3932/files/rapagelufijizewezumegi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5003/2549/files/auralux_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9652/files/if_function_in_excel_2020_with_multiple_conditions.pdf
    • https://cdn.shopify.com/s/files/1/0432/5697/1432/files/12116198334.pdf
    • https://cdn.shopify.com/s/files/1/0438/6953/6411/files/parikaropugawikanamej.pdf
    • https://cdn.shopify.com/s/files/1/0441/0431/9128/files/sovokuxuxupumiwuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/7271/4920/files/uniform_building_by_law_malaysia_1984.pdf
    • https://cdn.shopify.com/s/files/1/0428/9386/9212/files/ferewo.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_off00006e41.bin
ae4fdfe0e1aa2e90d64ac7df87ad7c91c5f781a3cd4fb7cedf989ce70ea1a229		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E41 4800 bytes
font_01_sfnt_off00007ea4.bin
391aa7f86ce9735140def48274f6cae2e91ff24cefbdfbb1f07d889f2ad05ba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA4 11084 bytes

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