Malicious PDF — malware analysis report

Static analysis result for SHA-256 5916e7c2a5786f40…

MALICIOUS

PDF

42.9 KB Created: 2020-08-05 02:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77b8b69b866dcd2f3ab4791f63cdb00f SHA-1: b8375ecf9ae88f1cc75be3639175291d11b82587 SHA-256: 5916e7c2a5786f40f70e36c6e391e409409cef44543bd9fbb191d0dfd315ca60
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a large number of embedded links, a technique often used for SEO link farms or to redirect users to malicious sites. One critical heuristic firing specifically noted a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=pdf+file+structure'. The document body contains garbled text but also includes several URLs, some of which are confirmed benign, but the presence of the malicious redirector link is a strong indicator of malicious intent.

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=pdf+file+structure
    • http://files.stonecreekcabins.com/uploads/1/3/1/3/131384575/lepajo-gejexoxexo-kiwojiwiboga-zajusoguka.pdf
    • http://files.backbeatphotos.com/uploads/1/3/0/8/130874583/sanavipogejegu.pdf
    • http://files.coladoart.com/uploads/1/3/0/7/130739489/pamebixuvo.pdf
    • https://cdn.shopify.com/s/files/1/0437/4704/9621/files/mastercam_x9_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/6365/7119/files/14648798768.pdf
    • https://cdn.shopify.com/s/files/1/0427/4028/5607/files/jovejavosiwamog.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/derukoboda.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21511039237.pdf
    • https://cdn.shopify.com/s/files/1/0434/9856/9888/files/popular_arab_song.pdf
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/madiwemaresolasu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1706/files/nerizapen.pdf
    • https://cdn.shopify.com/s/files/1/0430/9689/9733/files/88943594967.pdf
    • https://cdn.shopify.com/s/files/1/0444/4015/8374/files/harley_davidson_golf_cart.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/5970164963.pdf
    • https://cdn.shopify.com/s/files/1/0433/4567/4389/files/342449631.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_off00006bb6.bin
a65892d72f13c43700cbfb729bf9da3fb5dd17c3be1a4bd8e1f10403cbf38336		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB6 4808 bytes
font_01_sfnt_off00007c21.bin
762a39b5b8d03439b6f5683516a1c18d370e81b181ac4bc78529b6263098db20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C21 10300 bytes

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