Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a8d5e9fc4bbca8…

MALICIOUS

PDF

38.1 KB Created: 2020-09-01 17:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7a6404b4ebe4bd760a1544ea36bfd2c SHA-1: 26304ca2d519f41a53c21af8a005c525c3d13571 SHA-256: a6a8d5e9fc4bbca8ac7cfda3de9f8f46407414a7958222a10684b986cb9ebf78
150 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 firings indicate this is likely part of an SEO link farm designed to manipulate search engine rankings or to redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated.

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.club/wix?keyword=beat+pe+booty+song++pagalworld.+io
    • https://cdn.shopify.com/s/files/1/0435/5689/6927/files/9112495885.pdf
    • https://cdn.shopify.com/s/files/1/0434/6734/1981/files/99375610724.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/76436761717.pdf
    • https://cdn.shopify.com/s/files/1/0438/1769/7437/files/resuvinerovugifokovoz.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8815/files/kedifozireva.pdf
    • https://static.usrfiles.com/ugd/8cbfce_b7e6c58676bb4ef48896ff2a220e93a6.pdf
    • https://static.usrfiles.com/ugd/6290de_9135fc35c8bc4055b322b8350731fc01.pdf
    • https://static.usrfiles.com/ugd/b8c837_a21b72bb2cfa43b981a0160bcc6d9be2.pdf
    • https://static.usrfiles.com/ugd/79cb75_cab72242d4284be2830a433678ce03e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_6da2dc5df60c4aa28a00aed2239a116b.pdf
    • https://static.usrfiles.com/ugd/04e6f9_2272cf1e0057491c80489721bad85344.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_off00004cd2.bin
54c7f8995ba55aa41d9be47e44ece78e424d9ac78a7c4063e2211e0bddabeb99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CD2 5540 bytes
font_01_sfnt_off00005fcf.bin
f3eded054f18113b16d524072c688eaada706d23260ec7eb34b9047d36bebb0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCF 14260 bytes

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