Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d62dc5aea229520…

MALICIOUS

PDF

54.2 KB Created: 2020-08-30 13:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9527ecfc62b17ebf808d1f87d285aabf SHA-1: 3b565a4cae53e375423f1f804994cca6ef2a38a1 SHA-256: 4d62dc5aea229520920b6e6aaee40e6602ac26b6253b4b71b37bfe2d7c210015
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, https://ttraff.cc/wix?keyword=world+greatest+fake+book+download, is designed to lure users into downloading a fake book. The file also contains a large number of embedded links, many pointing to static.usrfiles.com, which is flagged as a link farm. The primary malicious IOC is the redirector URL.

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=world+greatest+fake+book+download
    • https://static.usrfiles.com/ugd/b8c837_84db9e038b76482c880203a6b52351f6.pdf
    • https://static.usrfiles.com/ugd/48f461_2d63f2fd7c424276a809ae9bdc2a5851.pdf
    • https://static.usrfiles.com/ugd/3f0e57_6f6d070d12b94c3598cab439195b343a.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4440/files/kevodinofipowuridi.pdf
    • https://static.usrfiles.com/ugd/b8c837_da0534fc26834392a6891e7b16b012dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3b49f95a5c642d592cd8b27a3dfc7db.pdf
    • https://static.usrfiles.com/ugd/b8c837_62554cc13aa845dcba8afb20289ed26a.pdf
    • https://static.usrfiles.com/ugd/585b1d_345c9139116b4d1cbbff01f5cb6c7a3a.pdf
    • https://cdn.shopify.com/s/files/1/0430/0154/4863/files/timejoxotesaxewox.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1315/files/23961346043.pdf
    • https://cdn.shopify.com/s/files/1/0429/2847/2220/files/72107501451.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_off000093ff.bin
9afc2bb58fa94b154fd9b5c78fdb2973eba2808e56619ead1238af5296885a4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93FF 5384 bytes
font_01_sfnt_off0000a683.bin
c0273912f9cbea99d54fa552796cd97799a1871025b593278444f6adbda5604f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA683 11256 bytes

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