Malicious PDF — malware analysis report

Static analysis result for SHA-256 8944a530e1321dd1…

MALICIOUS

PDF

38.5 KB Created: 2020-09-01 13:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 978550a11b7aea5a1e3f80dde5a70b7c SHA-1: 29661c037f98ca904a810a16a4a229b084730a1e SHA-256: 8944a530e1321dd1c5b1b637f0eacf646465fd9eed3abe6eaf11fe13b85e5e00
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a link farm, indicating a likely attempt to direct users to a malicious website. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample, but the presence of multiple external links suggests a delivery mechanism for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=california+math+ccss+answers+7th+grade
    • https://static.usrfiles.com/ugd/6f7357_dc545512f323473ea158aa38a1bcb496.pdf
    • https://static.usrfiles.com/ugd/7ff653_07dcb90f941c4cd683712dc1c1ec6b4a.pdf
    • https://static.usrfiles.com/ugd/fe83c3_085a50dfcd2048b68d1abcca5e964538.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_2f0d24a8d1fe495f8e0187e30e638f08.pdf
    • https://static.usrfiles.com/ugd/ae059d_1694868bfcbb45619e2b481639612d72.pdf
    • https://cdn.shopify.com/s/files/1/0439/5663/3758/files/pga_used_club_price_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0071/files/meduwubaxulidewuwepefifix.pdf
    • https://cdn.shopify.com/s/files/1/0432/4337/2703/files/animal_farm_characters_analysis.pdf
    • https://static.usrfiles.com/ugd/362633_fd225abbf00949f6bca581e6aae0a2fd.pdf
    • https://static.usrfiles.com/ugd/db93e9_236b7a5b0ed64ff9ba157d7c014a26b5.pdf
    • https://static.usrfiles.com/ugd/c1108c_3315b6ecfe9d46429a0cc4d3763c7748.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca6441ce93f14ebc8f5c88d7378ac92e.pdf
    • https://static.usrfiles.com/ugd/cac9e4_1c1cf95b7c284be1b4ae4e4667b308b5.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_off00004e08.bin
d45ac3f5ccdaa34412928d00968f70f2f4ed586bb55cc8bf8b7477d6e915f1e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E08 5512 bytes
font_01_sfnt_off000060b4.bin
4426ca189d27dec2c9305eccb129c380994257814c4cf48daac938f6ea097894		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B4 14580 bytes

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