Malicious PDF — malware analysis report

Static analysis result for SHA-256 923f0b9e9eda39d3…

MALICIOUS

PDF

37.0 KB Created: 2020-08-31 03:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e8009f90b48fb4068f552de8a61cf7a SHA-1: f2f39cf3c02c4ae03499a5daa8935c3717b38e9a SHA-256: 923f0b9e9eda39d3d65fdf87a3df095c2ea51a2e3cf3c29bb1d8a94273ead771
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to a known malicious URL. Additionally, PDF_SEO_LINK_FARM indicates a large number of external PDF links, likely for SEO manipulation or to host further malicious content. The document body contains the primary malicious URL and several other PDF links, reinforcing the lure. No scripts were extracted from this sample.

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.ru/wix?keyword=letras+de+febrero+para+periodico+mur
    • https://static.usrfiles.com/ugd/b8c837_4f29730199814299abdcd09b5dc01cee.pdf
    • https://static.usrfiles.com/ugd/e23fbb_45ef71df4daa428293046d70799174ab.pdf
    • https://static.usrfiles.com/ugd/57c819_efcbed4043854c8497e778b2095b3164.pdf
    • https://static.usrfiles.com/ugd/696117_bbdde20ecc894551a2c444fcbedbe20a.pdf
    • https://static.usrfiles.com/ugd/b8c837_93acebf79db545608ff8a3e82f9c4b1b.pdf
    • https://static.usrfiles.com/ugd/b8c837_f75bd20688a340b8bd166cdcea3d0ce6.pdf
    • https://static.usrfiles.com/ugd/1b8612_f4900cd27ae14562bd63f9721c15379a.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a12568969754dccaee4bf1f88b6d39a.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/43888945287.pdf
    • https://cdn.shopify.com/s/files/1/0435/7623/0047/files/84904769339.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/duzitakuxojanutowakim.pdf
    • https://cdn.shopify.com/s/files/1/0435/0876/0735/files/problem_solving_101_ken_watanabe_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/1350/5185/files/wamapaje.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9146/files/suzimo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8188/files/cantos_camino_neocatecumenal.pdf
    • https://cdn.shopify.com/s/files/1/0437/6517/0334/files/65013544743.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/81848594463.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_off000050ba.bin
07b9521ae8d5117f8cf88c46c7a6750912686d2413871ed1e76ab03e1a36a6d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50BA 5348 bytes
font_01_sfnt_off000062c9.bin
972cb37f31e880b62e9e7fac865178722d2c32e9586d476a38967798b6e06f1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C9 10820 bytes

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