Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ca80bdf5096230…

MALICIOUS

PDF

35.9 KB Created: 2020-08-29 22:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51c913fd0af2202b63d68a5be01cfce5 SHA-1: fa6aff1e715146a42ebac3ef3944659488ef82a9 SHA-256: 52ca80bdf50962303aec6d1486422d7a5d92b155cce2e5443f4851617663536e
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One of the primary links points to a known malicious redirector. The document body itself is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, suggesting it's not a legitimate document.

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=distribuci%25C3%25B3n+muestral+de+la+relaci%25C3%25B3n
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12086745869.pdf
    • https://cdn.shopify.com/s/files/1/0435/9349/8787/files/font_creator_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/rupor.pdf
    • https://cdn.shopify.com/s/files/1/0437/8502/7745/files/biguxagiv.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce1ce81e67c94c0eb1b774aeb30db866.pdf
    • https://static.usrfiles.com/ugd/b8c837_3660a2cb9bf04d14a9ef227cb72b6c90.pdf
    • https://static.usrfiles.com/ugd/d94ae5_96aa30e04048456ca90b603d1ace2bdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_94a734d428014021b55e1f01f855b377.pdf
    • https://static.usrfiles.com/ugd/b8c837_15e9eb2a86294556bd47030af114e33a.pdf
    • https://static.usrfiles.com/ugd/b8c837_6449315d0e44409598dd7ff201f59c26.pdf
    • https://static.usrfiles.com/ugd/de3d83_47667669be164713ae9f0ea89b3a2aee.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5876/files/33326167435.pdf
    • https://cdn.shopify.com/s/files/1/0430/9821/0461/files/miloganukixeroxataneg.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/mesasuralifodokenizelopew.pdf
    • https://cdn.shopify.com/s/files/1/0437/1274/1529/files/ruxemufuguteno.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_off00004b78.bin
1314561a82c15dc1eab8a0fecbe8964a7457f6af8d84df5eda5a0c0d8fd42629		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B78 5360 bytes
font_01_sfnt_off00005d4a.bin
e51bc371434738f0d9cef03e917ca8c4bec9d2dcfeec6700ec10af5daa856fb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D4A 11100 bytes

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