Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ea748bc17a16cb…

MALICIOUS

PDF

39.6 KB Created: 2020-09-04 13:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e6f10561d3fde5344a33c21e4096bcb SHA-1: 211b6ae7fcf90d50076f59073909e188493f6a3a SHA-256: a5ea748bc17a16cb42b99d363018e94bb15104c0a2506d1aefbd560f8e816555
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, pointing to 'https://ttraff.club/wix?keyword=chehalis+river+report'. This URL is presented within the document body, suggesting a social engineering lure to trick the user into clicking it. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to Shopify-hosted PDFs. The primary malicious URL is the most critical IOC.

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.club/wix?keyword=chehalis+river+report
    • https://cdn.shopify.com/s/files/1/0452/8416/3746/files/present_continuous_tense_exercises_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2868/4701/files/kali_linux_vm_install_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/2223/8375/files/credit_reference_request.pdf
    • https://static.usrfiles.com/ugd/739437_4ea7d66541504fd99c8c2d80c3d1facb.pdf
    • https://static.usrfiles.com/ugd/185811_f3ae1a4763754ab5a6e058c991409f2a.pdf
    • https://static.usrfiles.com/ugd/0a0016_508e567245c94e07aa8d2dbe1f85bfcf.pdf
    • https://static.usrfiles.com/ugd/e02969_5e4617a3c7694ce5b40b6c298c529ee3.pdf
    • https://static.usrfiles.com/ugd/1f6d71_7f8a7a856f054bc9b0f0ad75948bed4f.pdf
    • https://static.usrfiles.com/ugd/b98abb_6410cfb5dfb942d8b28f398cca750f8a.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/66026563678.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3856/files/gaxinapemijovoxibamoliba.pdf
    • https://cdn.shopify.com/s/files/1/0434/0776/9750/files/xenev.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_off00005f94.bin
dd7c51b20090ad0d5987a2ff208ff40fb5348731ebfd2be69948dfb19ba659f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F94 4872 bytes
font_01_sfnt_off0000701e.bin
56ecfc245be98ab40d7d8a3d42116ac44a5ee5c3f0c1d6a66065710728cf8e6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x701E 9912 bytes

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