Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4e1cf5fe4c26e3…

MALICIOUS

PDF

42.2 KB Created: 2020-08-14 00:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ae1d2bb18ea5abb0a478ffacaf11eac SHA-1: 2133be44ec30d0df693acad4157db23647fc99b6 SHA-256: cf4e1cf5fe4c26e3feec747f0af8ad883c54c2d6b4d25992c0d94be8a5adb8fa
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, many of which point to external sites, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=azote+formule+de+lewis'. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but the primary malicious function appears to be the redirection of users to external content.

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/pify?keyword=azote+formule+de+lewis
    • http://files.capoeira-aca.com/uploads/1/3/1/3/131384071/niled-lesisowesipo-laxijeviva.pdf
    • http://files.cmbuilders.org/uploads/1/3/1/3/131383456/lagebivolexolox.pdf
    • http://files.pinevalechildrenshome.com/uploads/1/3/2/6/132681901/f912dd.pdf
    • http://topuna.ode2oddz.com/uploads/1/3/1/4/131437532/timikuxir-rizuma-dibevoraferef.pdf
    • http://files.noodlefactoryjazz.com/uploads/1/3/0/7/130739522/75bf8d075839f1.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5465/files/asymptotes_in_calculus.pdf
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/disidiletiwajokut.pdf
    • https://cdn.shopify.com/s/files/1/0433/8044/1238/files/pressure_switch_calibration_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0437/9715/1904/files/betrayal_aleatha_romig_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3463/1579/files/51682498582.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/povefikemojeboretowoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/9043/4455/files/lixuvederufoleb.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1110/files/pexazinorezuj.pdf
    • https://cdn.shopify.com/s/files/1/0454/3823/8878/files/pisogilawurij.pdf
    • https://cdn.shopify.com/s/files/1/0439/2586/4603/files/antagonistas_opioides.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_off0000645b.bin
de75a578de3d53097e92f7837f617b81e2b1ac3e4db9a1762b4cac3c8e0c5b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x645B 4976 bytes
font_01_sfnt_off0000754a.bin
de8c032935c95f29838f2264229dd85fdf014cec8caa9bdba1b0a383fba20317		 pdf-font-stream PDF embedded font (sfnt) at offset 0x754A 11460 bytes

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