Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba4df0403d2c5a7…

MALICIOUS

PDF

37.9 KB Created: 2020-08-29 08:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e9e9d5e9f8ab9f7a62d9923468809fd SHA-1: 8912445fd80fe5fc00aaf458b15e9f2be61d0daf SHA-256: 9ba4df0403d2c5a764a31be67ab206a81821f8b61c912bbb6d53e6d29ac4c761
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating a link to known malicious infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.com/wix?keyword=www+k12reader+com+answers, which is likely intended to redirect the user to a malicious site. The PDF_SEO_LINK_FARM heuristic also indicates the presence of numerous external links, suggesting a tactic to distribute malicious content or engage in SEO manipulation for malicious purposes.

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.com/wix?keyword=www+k12reader+com+answers
    • https://static.usrfiles.com/ugd/b8c837_ca90cdc4ee4248cb9a02fae74eff77a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_de84b0372ee94273bc50965e0f4c71ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_91e4cd5f6e8c49ab92b060318affabda.pdf
    • https://cdn.shopify.com/s/files/1/0433/7169/2188/files/android_ui_automation_testing.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/attitudes_personality_and_behaviour.pdf
    • https://cdn.shopify.com/s/files/1/0429/3997/3788/files/vuzup.pdf
    • https://static.usrfiles.com/ugd/b8c837_4cf72ad046b24101b4086443fe393677.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec91ed554d8b4c7890fbe5ab775b1a12.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f15bf8ca81d47c7aa6493ce4159c306.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0676/files/75854018413.pdf
    • https://cdn.shopify.com/s/files/1/0436/9137/6794/files/66484362083.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_off00005697.bin
341e6148d79e01eead735b16e2eebeffbebe905197a08d429f783883e64bef90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5697 5408 bytes
font_01_sfnt_off000068fe.bin
b8bbaf585f90758ec0974b70cfae50a7e3c757cc60205938cd7c0d9a28a87f4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68FE 10072 bytes

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