Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dab095e4d82af21…

MALICIOUS

PDF

42.4 KB Created: 2020-08-29 21:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93aa8b13d0ae8e211f1517843c9a0a8e SHA-1: 769b18f22fd688642ed0ceaa7ef5117722d2ec7a SHA-256: 1dab095e4d82af2180177f7fcc160e55bf748494b7fa4597c0d78ca6b3c35d31
120 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text fragments and URLs that suggest a lure related to 'vex coding studio tutorial'. The primary malicious URL, https://ttraff.ru/wix?keyword=vex+coding+studio+tutorial, is likely used to redirect the user to a further malicious destination. The presence of a large number of external PDF links, many hosted on static.usrfiles.com, indicates a link farm or SEO poisoning attempt to increase visibility and traffic to the malicious redirector.

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=vex+coding+studio+tutorial
    • https://static.usrfiles.com/ugd/b8c837_fa25e1f126944930bdbefbf180af2a56.pdf
    • https://static.usrfiles.com/ugd/3f0e57_c946ae749e3047e6893e9ced783ee630.pdf
    • https://static.usrfiles.com/ugd/b8c837_92d2526c93cb496e9193eaea4a828be4.pdf
    • https://static.usrfiles.com/ugd/b8c837_8657b16b46ef4a44aa561a4287601a24.pdf
    • https://static.usrfiles.com/ugd/b8c837_09334912cfe84fe58a2eb31cacd0fefb.pdf
    • https://static.usrfiles.com/ugd/b8c837_3462070560c4448b9b6904571638a6a0.pdf
    • https://static.usrfiles.com/ugd/c63dba_e00e12335e0b476bbba2252d361d8bce.pdf
    • https://static.usrfiles.com/ugd/0aab01_1c646bf0d6814968b03d55685186a4e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_c99193cc0183462995fb5114baa79c59.pdf
    • https://cdn.shopify.com/s/files/1/0448/5578/7681/files/drum_carder_for_sale_craigslist.pdf
    • https://cdn.shopify.com/s/files/1/0432/1522/4996/files/72188417864.pdf
    • https://cdn.shopify.com/s/files/1/0434/3840/7845/files/84117742807.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005aa0.bin
41e9309bac17469100108bef9f01cc7cc620c0884ec78dfb9b0c3390a9c968ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA0 3656 bytes
font_01_sfnt_off000067b1.bin
758aae5a9764e764d104b8a5bfa6637f360dc255242eedca7842fc3e2d7007eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B1 5140 bytes
font_02_sfnt_off0000793c.bin
5000de863dcf42ea78f3b762780070640d7131129b1131e921fd32f4931feb5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x793C 10448 bytes

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