Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb07a337a008419…

MALICIOUS

PDF

57.3 KB Created: 2020-08-30 03:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d622c4511b890acd33a6f5e00947131 SHA-1: a243e1e2c1ad522253b473c736d79831e1b4e05a SHA-256: 1cb07a337a008419fa089f3155fc3bc0897d9d8160d63bfa6b9444237fd0dece
120 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised as a summary of financial accounting standards. The document body, though heavily obfuscated, contains the same title and the malicious URL, indicating a social engineering attempt to drive traffic to the redirector. The presence of numerous other links to PDF files, many hosted on static.usrfiles.com, suggests a link farm or SEO poisoning tactic to improve the ranking of the malicious URL.

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=international+financial+accounting+standards+brief+summary
    • https://static.usrfiles.com/ugd/8acad3_df3019de27f249d2a0a078ba3eb233d6.pdf
    • https://static.usrfiles.com/ugd/5ecadc_8d0eeecaae9a4175b5655705e12981fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6669a76336f4ab58e9517c4f2a0b01a.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3022/files/crystal_reports_for_visual_studio_2017_tutorial.pdf
    • https://static.usrfiles.com/ugd/c1de29_b25635b0016f4e4298dde0d371bea26e.pdf
    • https://static.usrfiles.com/ugd/3be3a7_80d21263bd124243a6bde6ddfa26c30e.pdf
    • https://static.usrfiles.com/ugd/b8c837_39819be299b749e4a93c58badf226a85.pdf
    • https://static.usrfiles.com/ugd/b8c837_cda46ba4730747419bd7f9e1bb3a2070.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ca7bcca2a004a4d8b6e0725b8a638ac.pdf
    • https://cdn.shopify.com/s/files/1/0436/2931/4206/files/debugoxigifekilesegitaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/fomidovenix.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_off000094dd.bin
3138c5e4c814f851a0c74d53d18b2c9622947dc95e1cd7d42937d86bfce0869c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94DD 5404 bytes
font_01_sfnt_off0000a71f.bin
97b16388f2dc5e9017b9e0cc644c19be533381c3b38fd9ca68cdd45f21399aa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA71F 10292 bytes
font_02_sfnt_off0000ca4e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4E 4324 bytes

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