Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44672d5cbdf7a1a…

MALICIOUS

PDF

42.2 KB Created: 2020-08-30 13:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55a49b34fb0468188a6f7ae6f48e8512 SHA-1: 887e87d7a157be3021fc11d0a2e68f7fe8f16e3c SHA-256: f44672d5cbdf7a1a4ac15353387b75c7bf49aa256e4a7ff5d46a7d4a35da0b46
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. The primary malicious indicator is a link to a known redirector infrastructure at ttraff.ru, which is likely used to obscure the final destination of the attack. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector, suggesting a social engineering lure to entice users to click on the link. No scripts were extracted from this sample.

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=number+flashcards+1-20+printable
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42539854631.pdf
    • https://cdn.shopify.com/s/files/1/0430/6803/1143/files/fititotokezemu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0591/0933/files/69823726097.pdf
    • https://cdn.shopify.com/s/files/1/0431/8514/3969/files/40221704184.pdf
    • https://static.usrfiles.com/ugd/b8c837_31abda09386c4690a9519d8b20c6ffb2.pdf
    • https://static.usrfiles.com/ugd/0047a4_63593c732df041e886fe2cec4e8122de.pdf
    • https://static.usrfiles.com/ugd/23e9be_1516dcd64c414240855c3d73cb00b9c5.pdf
    • https://static.usrfiles.com/ugd/5a1791_4f3af6d188aa4ac1bda953aae8245c46.pdf
    • https://static.usrfiles.com/ugd/b8c837_1285a1d03aaa434186f99d8ee747aa87.pdf
    • https://static.usrfiles.com/ugd/cb2bed_d1771e504dcf4ac6a6fca26b3544d6eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcbed99362e3420ea838c0c4bbed583e.pdf
    • https://static.usrfiles.com/ugd/4725f1_492fb09ae5c64cf2ae1431ebed63dc1b.pdf
    • https://static.usrfiles.com/ugd/3b47cb_d484abfb8b2a466abe71020707095a39.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed9760caa78041888ba70a56e72639cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_51e18f378204404bb747b8fc34048345.pdf
    • https://static.usrfiles.com/ugd/80c1db_e31200b5eb7b4d42ab1b79da2464bf02.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_off00006654.bin
d115c1ef7ecb0f9f7da29b24a3dde282faa919ce75982658fd9c8fa169a777ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6654 5860 bytes
font_01_sfnt_off00007a24.bin
5f9a82fbabc902ce886dc5f56e0abb77cd202200c47efb0262f6010e9643cc65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A24 10012 bytes

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