Malicious PDF — malware analysis report

Static analysis result for SHA-256 4584a519afa55154…

MALICIOUS

PDF

45.2 KB Created: 2020-08-31 21:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9de42ad04d903ee349353e0a505b9df5 SHA-1: b6b2a1a1ee3e4aa52e13c86dbe50b17ad17046af SHA-256: 4584a519afa551548a55f55c7071c8e9cc492184a023672a926b690ed58edbc7
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. This link is presented within the document body, disguised as a resource for 'performance appraisal journal articles pdf'. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on static.usrfiles.com. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link.

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.com/wix?keyword=performance+appraisal+journal+articles+pdf
    • https://static.usrfiles.com/ugd/b8c837_506f562396bf4f09bcbc7d1bd30129cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_964dd730ac994cffbda67c091e7c80a6.pdf
    • https://static.usrfiles.com/ugd/87d215_f26a77bd25d94bbb9a0edbcfd53b73e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fff7b68288c4d4aa3b5cfc398ae3d2f.pdf
    • https://static.usrfiles.com/ugd/c1de29_98e54a7fe241497abfb91b55870b7b91.pdf
    • https://static.usrfiles.com/ugd/7baf93_a9c9fb65ebcf45c9b0cd3f91bcb66d13.pdf
    • https://cdn.shopify.com/s/files/1/0433/6739/9575/files/pauvre_anne_chapter_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2343/files/59240284726.pdf
    • https://cdn.shopify.com/s/files/1/0438/6829/1232/files/instant_apache_camel_messaging_system_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/1988/7001/files/13247228699.pdf
    • https://static.usrfiles.com/ugd/dba42a_d4a8865672d1402fb4ba982ee17ef422.pdf
    • https://static.usrfiles.com/ugd/b8c837_8bda8bdaa3984470a4fde9f2de22f781.pdf
    • https://static.usrfiles.com/ugd/b8c837_bcdba029e50f433c80ea3aa3731eb84a.pdf
    • https://static.usrfiles.com/ugd/de3d83_782bf2e8a2604b9882c489e60d054a97.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_off000071e4.bin
a137e0de146ff5573b103430c22a1a521ce67664464ade4d01af84de84414856		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E4 5380 bytes
font_01_sfnt_off0000841a.bin
9f69f44a4434d29b572b6602ca34873337dd1a7c47ce18edb6d5c14d7d1dfa0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x841A 10576 bytes

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