Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f76a9e3290a663…

MALICIOUS

PDF

39.3 KB Created: 2020-08-29 20:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b723ea343a9239a16d69b2a68b3f661 SHA-1: b8a5e252bc6c8ad75b3d6fa179544a83d9bac5d9 SHA-256: 55f76a9e3290a663e7aec47c1e91085ffd4a6a32e2402124cbf8ea69f157e2ff
120 Risk Score

Malware Insights

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

The PDF file contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Pathfinder character sheet form fillable' and the malicious URL. This suggests a social engineering lure to direct the user to malicious infrastructure. No scripts were extracted, limiting the analysis of further payload delivery.

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=pathfinder+character+sheet+form+fillable
    • https://static.usrfiles.com/ugd/b8c837_65e00add5f7e4f819b732a07367ea238.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3ff1f96ac4e4a24bc5ccdc4a0ac3321.pdf
    • https://static.usrfiles.com/ugd/b8c837_827da922098545088a16e3430e65f54c.pdf
    • https://cdn.shopify.com/s/files/1/0434/5918/2745/files/zixumotofisidiritipaxu.pdf
    • https://static.usrfiles.com/ugd/a4e402_c61d854d2794493a98c1926f77223bd2.pdf
    • https://static.usrfiles.com/ugd/b8c837_8049b98673904312b7b2d5c28064677c.pdf
    • https://static.usrfiles.com/ugd/b8c837_74918371facc4024b1a65e227b7327a6.pdf
    • https://cdn.shopify.com/s/files/1/0428/1355/4855/files/8038862209.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/bottom_bracket_cable_guide_trek.pdf
    • https://cdn.shopify.com/s/files/1/0427/7692/0220/files/cacert_pem_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/1523/2921/files/vakizupegovomugesevir.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3277/files/gebusivixutarawejedulagu.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_off00005af4.bin
496e1058911699ab378cd6731cd46797c42fc6a8ef37388a5d0bce8171f66456		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF4 5404 bytes
font_01_sfnt_off00006d19.bin
046967f157d01da6b456a541579606eff1a0581b0489c8839f30dec1aad08f5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D19 10324 bytes

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