Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6af273b9ca5a11a…

MALICIOUS

PDF

35.3 KB Created: 2020-09-01 17:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 600e270d329ea9dc54a65ef304339ea6 SHA-1: ecd402a61352a4ff39aaf83c0fa1a4c4421bd460 SHA-256: d6af273b9ca5a11ad22677bdd54902d2f62fe76f265fc6fc6a8ffb517e9c533b
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One of these links, https://ttraff.cc/wix?keyword=interesting+or+interested+worksheet, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick the user into clicking it. The primary goal appears to be redirecting the user 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.cc/wix?keyword=interesting+or+interested+worksheet
    • https://static.usrfiles.com/ugd/a1fb72_87c366e7fc08402da80a298fbae7a8bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_42246c1f7e694986bcaaca0ab1f366a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_c687637e74f74d27a788dbd22bed4b5b.pdf
    • https://cdn.shopify.com/s/files/1/0435/7026/6273/files/66863461631.pdf
    • https://cdn.shopify.com/s/files/1/0429/1995/2540/files/81731334743.pdf
    • https://cdn.shopify.com/s/files/1/0434/8100/6246/files/xezivimiz.pdf
    • https://static.usrfiles.com/ugd/9dda13_97f3b91f7c9a42a7a69d992e26c6ce7b.pdf
    • https://static.usrfiles.com/ugd/2ca09c_6daa07ef58be47d2a1431180ef1de286.pdf
    • https://static.usrfiles.com/ugd/9421c8_39ac2fc397d641b8a0b974e09fbeb746.pdf
    • https://static.usrfiles.com/ugd/9cb927_25db96d1bcf34486b801006bc4d44bb7.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baludugosutagaxoreforodul.pdf
    • https://cdn.shopify.com/s/files/1/0440/9117/9160/files/anglo_american_literature_grade_9.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/669297692.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_off00004c73.bin
78323f65fdf4a288e9e2ebcac4edc766cd17344b231cb7146a8152dc1dd747e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C73 4936 bytes
font_01_sfnt_off00005d4c.bin
093e24ea3aac7e40e7de679f984a4a9233579d29b3a4df86c583254bfb243e84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D4C 10304 bytes

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