Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d11a6705a1c416…

MALICIOUS

PDF

143.8 KB Created: 2020-09-11 11:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cd9a6bd4a1f731d9f837b07070c2e21 SHA-1: 85d8313b68a30777b2baaf56cbe9cd3dd8d85394 SHA-256: b1d11a6705a1c41663f04a90e2646b6754ae49e261027f82a4ddd719f361253a
128 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'intermediate accounting' and includes the same malicious URL. The PDF also exhibits characteristics of a link farm, with numerous external links, some of which point to 'static.usrfiles.com'. The 'SE_INVOICE_LURE' heuristic suggests a social engineering pretext.

Heuristics 4

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.com/wb?keyword=intermediate%20accounting%2016th%20edition%20solutions%20manual%20-%20chapter-10
    • http://files.1planet2see.com/uploads/1/3/2/8/132814972/vofukekoseb_mibekugegam_vovofilinulalum_figowudaj.pdf
    • http://files.thecreativityunleashed.com/uploads/1/3/2/7/132740798/nelipovude.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_36018bf99f0b4676957321c94066f582.pdf
    • https://static.usrfiles.com/ugd/96bf9d_711e86182bd742babfe9ea4a51219542.pdf
    • https://static.usrfiles.com/ugd/0d2fda_8a4a5ea474e74ffbb5903ba0f39d8b7d.pdf
    • https://static.usrfiles.com/ugd/18122d_20589428e7a4496191b4ff349fda0a31.pdf
    • https://static.usrfiles.com/ugd/a107db_2c4e6b7b849147248eb5d578715b3297.pdf
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/kovexu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6364/7137/files/52312189323.pdf
    • https://cdn.shopify.com/s/files/1/0428/6794/9724/files/reduce_size_acrobat_reader_dc.pdf
    • https://static.usrfiles.com/ugd/60933b_a69f3c07889c4a33b9c532beb24a8ba0.pdf
    • https://static.usrfiles.com/ugd/902d29_e3b61233703a44949e05492378abbaf2.pdf
    • https://static.usrfiles.com/ugd/5ed537_9d7abbc4d91243e1b358d01d7f0108c8.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_off0001ecfc.bin
bb634ccf687b391cb5c170a5f4504afff00013ce06a49b022d7fdcdecd2c403f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ECFC 5804 bytes
font_01_sfnt_off0002009b.bin
c61b132ba8ed1f801f97301c1a3acdfdf865da00b5a77b0f2f6ef8b82e7fb4e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2009B 15560 bytes

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