Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13f4db287506f73…

MALICIOUS

PDF

40.3 KB Created: 2020-08-21 14:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe8bf0ab2f56600165bd6d9d7567c098 SHA-1: 2c963cb6951f8c1b7c1210e36247e7a378248846 SHA-256: e13f4db287506f7304ee18da5b673ac7d26e5267dbf801b44968d53c67b04b61
120 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, containing numerous embedded URLs. One prominent URL, 'https://ttraff.ru/pify?keyword=apache+server+for+php+free', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links pointing to Shopify domains, suggesting an attempt to distribute or mask malicious content through a large number of external references. The primary attack pattern involves luring users to potentially harmful websites via these embedded links.

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=apache+server+for+php+free
    • http://vukozib.myeto.com/uploads/1/3/1/3/131383363/4644757.pdf
    • http://files.crystalcreekonline.com/uploads/1/3/1/4/131408899/2269808.pdf
    • https://cdn.shopify.com/s/files/1/0431/2596/4949/files/xesupobujasubadati.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/11286786524.pdf
    • https://cdn.shopify.com/s/files/1/0432/8590/5576/files/37711460651.pdf
    • https://cdn.shopify.com/s/files/1/0431/6138/7170/files/fofov.pdf
    • https://cdn.shopify.com/s/files/1/0430/9454/0452/files/jevaxabematazabusekuta.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/sedakekodewe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1061/files/48682195796.pdf
    • https://cdn.shopify.com/s/files/1/0429/9276/3039/files/best_commencement_speeches.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7254/files/irregular_past_tense_verbs_worksheets_2nd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0430/7966/3765/files/74986892547.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/redusidawanexoked.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_off00005e3f.bin
6e5d7c6ac41c0734d831c50902df36eef09ec48c9c8db5efcea04c0871844be7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3F 5120 bytes
font_01_sfnt_off00006faa.bin
6a8bd0e306f56725809d51cde8b48fa9b1a49c0331eb6f478f594116e5df3289		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FAA 10852 bytes

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