Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98d5383cfa49ce5…

MALICIOUS

PDF

52.1 KB Created: 2020-08-30 15:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7913d6ec1e26a8fd406ee8d48d38e96a SHA-1: 3da184fb312dd483d6ba0b70eb230d355ceafce6 SHA-256: f98d5383cfa49ce591f3a4d0c92f0cb0618ae79c9c08848bb36cc4794eacfe28
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting the document is designed to manipulate search engine results or redirect users to malicious content. 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.ru/wix?keyword=oxford+word+skills+basic+pdf
    • https://static.usrfiles.com/ugd/9219f8_295248777ca44d53a3b19be23038000d.pdf
    • https://static.usrfiles.com/ugd/b8c837_89ba8acef18a416eab540a220f16fe61.pdf
    • https://static.usrfiles.com/ugd/12f4eb_01d3a7bc62b9458aaf02c0bddad12b4e.pdf
    • https://static.usrfiles.com/ugd/314c35_b67dbad980f44db3bdc2b24c704021ef.pdf
    • https://cdn.shopify.com/s/files/1/0441/0372/9304/files/56862489838.pdf
    • https://cdn.shopify.com/s/files/1/0428/1666/7814/files/modern_brazilian_portuguese_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0436/5654/4409/files/convert_infopath_form_to.pdf
    • https://cdn.shopify.com/s/files/1/0432/7967/9646/files/regepokofewipitif.pdf
    • https://cdn.shopify.com/s/files/1/0461/6791/6696/files/graphic_design_flyer_templates.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4328/files/39887961636.pdf
    • https://cdn.shopify.com/s/files/1/0435/5388/2280/files/fipefigexor.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4204/files/45841387999.pdf
    • https://static.usrfiles.com/ugd/cb2bed_c68f329411504c70a8a0fd4b9d153e20.pdf
    • https://static.usrfiles.com/ugd/b8c837_8efc84ac797149e7b103bb65430a3f90.pdf
    • https://static.usrfiles.com/ugd/a44510_f6c0e0f69f7e4d12825e02be3329287a.pdf
    • https://static.usrfiles.com/ugd/e3ff21_4b13947007464e6499c32eeba0806008.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f6b.bin
b359f25fcb13a5b58a136db55fdae620c479517f8f783d9d55d9e6d9da537755		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6B 5024 bytes
font_01_sfnt_off0000909b.bin
d938875b1d1d6b4b66617ca7e55f57c3ed7ed1cb5b001cb3e322a42882c863a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x909B 10796 bytes
font_02_sfnt_off0000b513.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB513 4324 bytes

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