Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e3c59295752962…

MALICIOUS

PDF

46.8 KB Created: 2020-08-29 23:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99dba2f372e1c91c7734d6b0c4206b57 SHA-1: ae1f19103bb3994f9060b3a08d09ffd64bdff723 SHA-256: 43e3c5929575296211ae161b33bef60060f9a3001f9884be7c9953f16e32dacb
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The primary malicious URL, https://ttraff.ru/wix?keyword=10+ejemplos+de+sociedad+comandita+si, is embedded within the document body and appears to be the entry point for a redirection chain. The presence of numerous other links to PDF files hosted on static.usrfiles.com suggests an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=10+ejemplos+de+sociedad+comandita+si
    • https://static.usrfiles.com/ugd/b8c837_6718665c2c244bb0a2cd4bbcf9101354.pdf
    • https://static.usrfiles.com/ugd/b8c837_c87dbd217165444982bf33fe136bafaa.pdf
    • https://static.usrfiles.com/ugd/2e16aa_9fdd2fdcf9524f8d88bba1173d648cd9.pdf
    • https://static.usrfiles.com/ugd/b8c837_bfa3c3610ba742a2be88244e439d246f.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/altruism_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/7825/4753/files/maduker.pdf
    • https://cdn.shopify.com/s/files/1/0432/5860/9819/files/zorasexunupavixi.pdf
    • https://cdn.shopify.com/s/files/1/0435/6590/8123/files/24422005361.pdf
    • https://static.usrfiles.com/ugd/89c6ad_e001cab8a49c4a22bc15708fbcc04a00.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8405a7a87514521a8b6e3a1fa891439.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_off000074d1.bin
7df31f4810760ad0b4b6d8c652f6d89f394a98ad05ef3a5b3a9668fcee782632		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D1 5296 bytes
font_01_sfnt_off000086c0.bin
be2954ce03798110a9262b998212f261c497a884eb4165735900b68e952f3a49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C0 11780 bytes

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