Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fd8da3dce08efe…

MALICIOUS

PDF

41.0 KB Created: 2020-08-05 12:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbe79f1a3ca9e971626c56667c412f40 SHA-1: fb7654754cc926580e993f6c21585997814bc62e SHA-256: e8fd8da3dce08efeb36b434d689605c9c28019fe593ec48df6bc5298702fe7b6
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends T1059.001 PowerShell

The PDF file contains a link farm with numerous external links, including one pointing to a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body contains garbled text and embedded URLs, suggesting it is designed to lure users to malicious sites rather than provide legitimate content. The primary attack pattern involves redirecting users to potentially harmful infrastructure.

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.cc/pify?keyword=proletariat+vs+bourgeoisie+pdf
    • http://files.mothersforothers.org/uploads/1/3/0/7/130739450/5c15bbe.pdf
    • http://files.wimfoxvalley.org/uploads/1/3/0/7/130776042/f335f392b0.pdf
    • http://files.jelanaduncangolf.com/uploads/1/3/2/8/132815960/nelozabi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/39258271266.pdf
    • https://cdn.shopify.com/s/files/1/0430/0265/8979/files/natilimapokuki.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/77917388966.pdf
    • https://cdn.shopify.com/s/files/1/0428/1086/7871/files/jovamufuwi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0817/files/89210964364.pdf
    • https://cdn.shopify.com/s/files/1/0433/7552/6051/files/bali_tourism_map_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0434/1330/7541/files/kebulet.pdf
    • https://cdn.shopify.com/s/files/1/0437/3859/5482/files/inorganic_chemistry_books_for_bsc.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12086745869.pdf
    • https://cdn.shopify.com/s/files/1/0433/6995/5486/files/rufumerexon.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3013/files/libro_de_microbiologia_medica_lange.pdf
    • https://cdn.shopify.com/s/files/1/0431/8131/0114/files/32574386858.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_off000062f3.bin
8a0959ecc1b302b21bd49965c436a5ba1256c9436e8c3cdb384fdd737fa69810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F3 5412 bytes
font_01_sfnt_off0000756a.bin
dcccdfc7774d13c856c983e5fe0e0d3b33ad65c9f2b32687b2d2b8df9de47581		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756A 9960 bytes

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