Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ba73382cb69f8c…

MALICIOUS

PDF

41.8 KB Created: 2020-09-04 20:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7830f2a15ad3491b44283a22c5467a49 SHA-1: 265aaccd288eb9a150d224dc671d9f202da70db4 SHA-256: 28ba73382cb69f8c5fe0a13f464e3f5f1feb56f46c8f3053930b35ac8c4037a9
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=harrison+bergeron+questions+answers'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many of which point to static.usrfiles.com. The document body, though heavily obfuscated, appears to contain the redirector URL. The primary attack vector is likely a user clicking the malicious link within the PDF, leading them to a potentially harmful site.

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.club/wix?keyword=harrison+bergeron+questions+answers
    • https://static.usrfiles.com/ugd/440e29_abb1bfee363d472e8f7506fca7d9b0b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_51e65490c53b4a0c88aa030be9b7a340.pdf
    • https://static.usrfiles.com/ugd/b52961_0bc8e72749814099bde5eea0ff6e9b4f.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4047/files/zuvabufanijafijoxuku.pdf
    • https://cdn.shopify.com/s/files/1/0436/6086/9785/files/carta_de_antecedentes_no_penales_estado_de_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7330/files/wamafabujinajusitamiki.pdf
    • https://cdn.shopify.com/s/files/1/0436/4497/7305/files/adverse_reaction_form_canada.pdf
    • https://cdn.shopify.com/s/files/1/0430/7058/7029/files/95589952993.pdf
    • https://cdn.shopify.com/s/files/1/0437/8394/6401/files/what_do_teachers_need_to_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/4188/1254/files/jazepamutova.pdf
    • https://static.usrfiles.com/ugd/fd4c29_91022189b2b0474494f4bb6bd592b222.pdf
    • https://static.usrfiles.com/ugd/c83fdb_35825a5a1ed44225bd62ba82873602a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_7d98f0d2691342979bbc3b757a464cc2.pdf
    • https://static.usrfiles.com/ugd/c8df25_8295380d8d3d47f4b326f4fde125264a.pdf
    • https://static.usrfiles.com/ugd/2eedf1_db0a7594920a48bab63412b8b066b44d.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_off000065e2.bin
999766972ac098e6f0576fffcd8f632e105c95e4c1540bcb35080dd6039050b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E2 5140 bytes
font_01_sfnt_off00007779.bin
7f78d981f21c009a78620c7d0262045c11b6bddbd43660b421708eba495e1bf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7779 10076 bytes

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