Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2a130155be0041…

MALICIOUS

PDF

43.7 KB Created: 2020-08-31 20:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b77554f610932a8392ef56eed94c9af SHA-1: 59f6cba4093ca49536214c933c3450c288137d14 SHA-256: 1b2a130155be0041c6e9c23f538ee5497e2ed31115fd3b403064547ae4bad955
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One of the primary links, ttraff.ru, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the URL and appears to be a lure for users to click on these links. The presence of a malicious redirector suggests an attempt to lead the user to a malicious site for further exploitation or credential harvesting.

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=causative+grammar+pdf
    • https://static.usrfiles.com/ugd/49be48_4e889e81fb534d7b888da24b3b43c0aa.pdf
    • https://static.usrfiles.com/ugd/3f4b99_c227a57e75534376b30cecbf0381ee40.pdf
    • https://static.usrfiles.com/ugd/d5415a_76b80c700c9a440298711283b2b71850.pdf
    • https://static.usrfiles.com/ugd/b8c837_7056f474405147048f057f18428ca38b.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c8fe72c7cba4dc697efdf1342edbf87.pdf
    • https://static.usrfiles.com/ugd/93c935_4be18deddeae49939ce099055f625dfe.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9a46efa61334b1a8f11765b61ed0241.pdf
    • https://static.usrfiles.com/ugd/3f80ec_8595c074e37b47d4983a659b1ce3007b.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c51e567f8ce48589556a5b611c7be17.pdf
    • https://static.usrfiles.com/ugd/19103d_e56f112af2094e9e89b54e706368108f.pdf
    • https://static.usrfiles.com/ugd/2486b5_fb3e6fc38d044411a914c20e1734a98e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1419705ab4874e0bac4a3c4176785338.pdf
    • https://static.usrfiles.com/ugd/b8c837_821e933222a64af9b7de43d3807d34f3.pdf
    • https://static.usrfiles.com/ugd/26481d_38a3e7eb8f1e4a8db94b874640d0829c.pdf
    • https://static.usrfiles.com/ugd/d54300_7b882fdd8b4142269f31a3af94cadab7.pdf
    • https://static.usrfiles.com/ugd/e3ff21_39e6685b67824db7847a715c49fee29d.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_off00006eea.bin
de27d3fe37e39133aa980308543e98b7ed241479471ac1017d8b33032e7bb7ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEA 5296 bytes
font_01_sfnt_off000080dd.bin
473445546689bf4294036562e2c2f6298eb6dc4699d58ad664c4977b922fc64e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80DD 9764 bytes

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