Malicious PDF — malware analysis report

Static analysis result for SHA-256 285dacd1b4338b34…

MALICIOUS

PDF

47.5 KB Created: 2020-08-29 13:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76d34521911fec454d4fcbbb56908fde SHA-1: f0605e88ab29dbe765fa5f567e4264c24fdaf175 SHA-256: 285dacd1b4338b34ce3c93cc22288e0cd84cfba5e6a137e13dc866d16152d7d6
120 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=v%25C3%25ADdeos+graciosos+m%25C3%25A1s+tard%25C3%25ADos+2011+su'. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous embedded links, many of which point to benign Shopify domains but are likely used to obscure the malicious redirector. The document body is heavily obfuscated and contains the malicious 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=v%25C3%25ADdeos+graciosos+m%25C3%25A1s+tard%25C3%25ADos+2011+su
    • https://static.usrfiles.com/ugd/b8c837_a0d1af00c1ee4338b3cfc7ea4d8fb1cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_5cd6842a3f7347c39226023b7cdfbb40.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0df2ae76987490d8f3634061c7a0593.pdf
    • https://static.usrfiles.com/ugd/b8c837_a141e5303cdf4d0892d752e5f9f955af.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/espaol_ingles_diccionario_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/9484/3293/files/dazojusigugede.pdf
    • https://cdn.shopify.com/s/files/1/0430/5692/2777/files/97380599476.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2667/files/chromium_ubuntu_16._04.pdf
    • https://cdn.shopify.com/s/files/1/0431/7888/5280/files/pifagolanixoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/8879/0179/files/55523700129.pdf
    • https://cdn.shopify.com/s/files/1/0435/6784/1443/files/53131843006.pdf
    • https://cdn.shopify.com/s/files/1/0437/8702/6581/files/90836365392.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0813/files/gopap.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_off00007404.bin
c813d3d3050df981d8eec3ac94db659b8d21c4ccf0eaec05bdf455eddf41034c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7404 5808 bytes
font_01_sfnt_off00008725.bin
956d54cd54263edd5ddfeaccbf18009f755d1e004ce946f0f36ca724f1197605		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8725 12352 bytes

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