Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42568601fb8169b…

MALICIOUS

PDF

47.3 KB Created: 2020-08-30 19:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 944445c82b3761b576af60b7a6370aa5 SHA-1: a4b97fd3b3e282e03a1ae802ab457db3ea28be2a SHA-256: a42568601fb8169b1170cf9fc25550a267481be56417cd5e38c0230ac17634b2
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a technique often used to create link farms for SEO manipulation or to host malicious content. One of the primary links, 'https://ttraff.ru/wix?keyword=blumenfeld+neuroanatomy+through+clinical+cases', is flagged as a known malicious redirector. The document body itself is heavily obfuscated and appears to be junk data, further supporting the malicious intent of the embedded links.

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=blumenfeld+neuroanatomy+through+clinical+cases
    • https://static.usrfiles.com/ugd/b8c837_8a102dd05cd640c09c166b36a8101432.pdf
    • https://static.usrfiles.com/ugd/38bf1f_503d34529abc456397637f140ac1a9a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_f38d507272ba4bb5ac3f24534b1883b7.pdf
    • https://static.usrfiles.com/ugd/05900a_776ff052847f48ba8d38736782589e6a.pdf
    • https://cdn.shopify.com/s/files/1/0436/9960/1576/files/clinical_interview_techniques.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_c30ed9847c46474d9c7b57c4229f7997.pdf
    • https://static.usrfiles.com/ugd/b8c837_353b0119927641cb82803edbdeb8fc6f.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pusowa.pdf
    • https://cdn.shopify.com/s/files/1/0437/4865/5265/files/girl_boss_sophia_amoruso.pdf
    • https://cdn.shopify.com/s/files/1/0434/1248/8348/files/37345366928.pdf
    • https://cdn.shopify.com/s/files/1/0430/2327/0042/files/kikusodexaxiwulewo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7840/9639/files/protect_workbook_and_worksheet.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_off00007b51.bin
49e8c9f9cf94fea715821c4830e70087ae8a2c7df7db31a6f95bf273ae8b1fc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B51 5584 bytes
font_01_sfnt_off00008e30.bin
c641e537dce6c8d98f4f87206ff3cbfb41b0c5081357b2077757d63680ad37a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E30 10112 bytes

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