Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41bc6ce06bc4b67…

MALICIOUS

PDF

36.1 KB Created: 2020-08-30 10:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a76490ecc3e386236f63f3aa86ec25f SHA-1: 04cbe3eea7e4deb025303ee6a9f7102ddf3673dc SHA-256: a41bc6ce06bc4b67d2ecc32013bca6f456e3b21e9531e01b531938c8d9c5d370
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

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=one+voice+wailin+jennys+sheet+music', is designed to redirect users to malicious infrastructure. The file also contains a large number of embedded links, many pointing to Shopify, suggesting a link farm or SEO abuse tactic. 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=one+voice+wailin+jennys+sheet+music
    • https://static.usrfiles.com/ugd/b8c837_593548b0b5c1493f8bb286054310df6f.pdf
    • https://static.usrfiles.com/ugd/a18aa6_cd4cff6f02c64c64b7f13eb230b40f1b.pdf
    • https://static.usrfiles.com/ugd/1d64af_bf057a3310864e1bac052224f8abbadd.pdf
    • https://static.usrfiles.com/ugd/b8c837_59faa54f4929421b8ef1af17bd4c860f.pdf
    • https://static.usrfiles.com/ugd/b8c837_65ba4661c4114ae5b19122fcf15efaec.pdf
    • https://cdn.shopify.com/s/files/1/0438/4669/7122/files/fundamentals_of_electrical_engineering_alexander.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6358/files/45692963597.pdf
    • https://cdn.shopify.com/s/files/1/0436/9671/7992/files/xusetesafa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8216/files/asynchronous_and_dc_machines.pdf
    • https://cdn.shopify.com/s/files/1/0432/1722/3840/files/90849810370.pdf
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/53351022684.pdf
    • https://cdn.shopify.com/s/files/1/0431/1387/3569/files/nutamijolinavisaxabis.pdf
    • https://cdn.shopify.com/s/files/1/0429/3938/3971/files/netmap_modl_indir.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/84407157552.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_off00004d5f.bin
3dfd6283f3c4acf8b0ae2f1c9ae360a04620ddeb07d7c4cd9c5138e4c4463e9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D5F 5300 bytes
font_01_sfnt_off00005f60.bin
b8478dc73e47641c0dc3229600783e84889ebacf81066129ee60c7602618a315		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F60 10600 bytes

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