Malicious PDF — malware analysis report

Static analysis result for SHA-256 21049a376811fb71…

MALICIOUS

PDF

46.9 KB Created: 2020-08-31 17:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cf0aca9c7479b0e5573fadb2379e4e5 SHA-1: 6b0aba933566afa2abf275ab6f15ac83948a842a SHA-256: 21049a376811fb715b1bc6c0b24ba35e3612e7f379bf9bdea72112086598de83
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to educational content and the malicious URL, suggesting a lure to disguise the malicious intent. The presence of multiple links to external PDFs, including one identified as a redirector, indicates a likely attempt to drive traffic to malicious content.

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.link/wix?keyword=corbettmaths+trigonometry+missing+sides+answers
    • https://static.usrfiles.com/ugd/eb5a6a_8e4c5dc8f1834211ad89c7c6709742d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_e361f78b2b334e9f896c843e33f55519.pdf
    • https://static.usrfiles.com/ugd/b8c837_da9089b82e744d2498ab6fadc3cd9248.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4cda6bd2d794ff4a1f776d213aa55d9.pdf
    • https://cdn.shopify.com/s/files/1/0435/6617/0271/files/63491812789.pdf
    • https://cdn.shopify.com/s/files/1/0435/6482/6773/files/70755883649.pdf
    • https://cdn.shopify.com/s/files/1/0430/1294/8121/files/tekeron.pdf
    • https://static.usrfiles.com/ugd/b8c837_3eb302010e414e41a3cf82b8467ae960.pdf
    • https://static.usrfiles.com/ugd/b8c837_79d62f8333df476db4b78d181843641c.pdf
    • https://static.usrfiles.com/ugd/b8c837_b47c0721ac234d118d943dcd9daec2fc.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tefukina.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1063/files/92114535743.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_off00007ade.bin
3e18efc739fb8828766db6c22917b9d926dab58d172ed722b9de6ba95ea27138		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ADE 5444 bytes
font_01_sfnt_off00008d41.bin
4db07827a4e7faca65ec84a29c90f95a03a96e7898bf47d102524db543de5ffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D41 9884 bytes

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