Malicious PDF — malware analysis report

Static analysis result for SHA-256 db711b393ad65ea3…

MALICIOUS

PDF

35.9 KB Created: 2020-08-30 10:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c3d8371c3ea648ae638b99b2890ca8e SHA-1: f896e2c91fdcb426459d4c7dfcaae860263e6c45 SHA-256: db711b393ad65ea3f9b259a9b3fde8fadebb9aa7e0593e5163ec8687c7fafeba
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to a link farm designed to redirect users. One of the primary URLs, https://ttraff.ru/wix?keyword=an+introduction+to+mechanics+kleppne, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other links, suggesting a social engineering attempt to drive traffic to malicious infrastructure.

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=an+introduction+to+mechanics+kleppne
    • https://static.usrfiles.com/ugd/b8c837_9cdc446cb89647cbac8fab006021e742.pdf
    • https://static.usrfiles.com/ugd/f09a9d_1a214f4803aa44738f4be77bc56fea57.pdf
    • https://static.usrfiles.com/ugd/362633_6ffe76bbe8414f0192874df581dad147.pdf
    • https://static.usrfiles.com/ugd/73f3b0_33d0fb3151d940758042fabf188b3700.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/varimesapadazop.pdf
    • https://cdn.shopify.com/s/files/1/0430/8425/1285/files/32629507455.pdf
    • https://cdn.shopify.com/s/files/1/0431/5929/0022/files/33650360459.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2040/files/81219271568.pdf
    • https://cdn.shopify.com/s/files/1/0432/4658/3976/files/96687220706.pdf
    • https://cdn.shopify.com/s/files/1/0435/2334/2495/files/6082766552.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4070/files/duwuzu.pdf
    • https://cdn.shopify.com/s/files/1/0459/6996/5216/files/gartner_report_for_firewall_2018.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_off00004f54.bin
d1d904a376eaad97a72139f70604e5d6e9ec45042b99439c6c1870266859ee66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F54 5368 bytes
font_01_sfnt_off0000615b.bin
99738d4411571588dd0a0b9e120010d515a6bc1b64ada9873b6b3a22ac7eb997		 pdf-font-stream PDF embedded font (sfnt) at offset 0x615B 9896 bytes

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