Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13351f6114f68c5…

MALICIOUS

PDF

40.9 KB Created: 2020-08-30 08:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6a6a6451f682b9d07771ee744df94af SHA-1: 20b3c839bb86091d16842a548e854c2a77223c64 SHA-256: f13351f6114f68c5128ccad37bdd15b110b2a73327afe72e17201cb1b2b7577f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=material+para+maestros+guia+santillana'. This URL is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other PDF links, while some are benign, indicates a link farm strategy, potentially to improve SEO for malicious content or to obscure the true destination.

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=material+para+maestros+guia+santillana
    • https://static.usrfiles.com/ugd/c7a620_fce1a983da704cbfa1ee9e18702bddbd.pdf
    • https://static.usrfiles.com/ugd/868401_f92232bf1c5c49218f1c62f956155969.pdf
    • https://static.usrfiles.com/ugd/b8c837_8eb3c54016d04d24ab1ab29580d5a40b.pdf
    • https://static.usrfiles.com/ugd/9d869b_a763c579a8ae4ae289d400d54521ff73.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c5f3da769b44a55b7a000acd9b8f06c.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e25ee465b3d428b8809d408e3070812.pdf
    • https://static.usrfiles.com/ugd/b8c837_627bd5e6270a411586a7054f928fac01.pdf
    • https://cdn.shopify.com/s/files/1/0441/0490/8952/files/76214844185.pdf
    • https://cdn.shopify.com/s/files/1/0437/8319/2738/files/2000_pontiac_montana_repair_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/8019/7031/files/32970327478.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/98757638804.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/gitovogeduguviv.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7796/files/15400799030.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_off00005880.bin
60bd38777b8b76833baa4e53ec182ddc33b746608ec3dba51ae69bccdbf46dc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5880 5144 bytes
font_01_sfnt_off000069ed.bin
4fa1d3077f6e88d5a8e4fd33843417c4e6d58d1a6f213d06005943372b82726f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69ED 13880 bytes

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