Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8aaa731400fe91c…

MALICIOUS

PDF

33.3 KB Created: 2020-08-25 20:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87acfb65a44a993913f14dce7215e20a SHA-1: 4eab3080bd0f6dc9477732944b2bed43c9b3ac1f SHA-256: b8aaa731400fe91cf6204b944bd741e66d267801bbb53821b1e744937a8bb8e3
120 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious URL, disguised as a song download. The PDF also contains a large number of links to other PDFs hosted on Shopify, likely as part of an SEO link farm to obscure the malicious redirector. The document body contains garbled text but includes the malicious URL, reinforcing the lure.

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.com/pify?keyword=download+lagu+back+at+one+brian+mcknight+mp3
    • http://files.liucpaaustin.com/uploads/1/3/2/8/132814935/kapawufetobuwapaf.pdf
    • http://files.wellsboules.co.uk/uploads/1/3/1/3/131379894/3457060.pdf
    • https://cdn.shopify.com/s/files/1/0433/7978/5886/files/1188024465.pdf
    • https://cdn.shopify.com/s/files/1/0448/9006/3003/files/jonbenet_autopsy_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/4434/6792/files/38158884294.pdf
    • https://cdn.shopify.com/s/files/1/0436/9927/3896/files/59929478005.pdf
    • https://cdn.shopify.com/s/files/1/0433/9420/3806/files/holt_chemistry_textbook_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0429/9040/3737/files/renuregiwasurikujuzovow.pdf
    • https://cdn.shopify.com/s/files/1/0435/6459/7397/files/mufunog.pdf
    • https://cdn.shopify.com/s/files/1/0434/5721/6678/files/sociolinguistics_peter_trudgill.pdf
    • https://cdn.shopify.com/s/files/1/0429/3741/7891/files/69411985687.pdf
    • https://cdn.shopify.com/s/files/1/0434/1284/8790/files/dofexakuki.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3387/files/derivative_of_inverse_trig_functions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/7051/1521/files/455491853.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_off000042ba.bin
0175826c3e32c29735fa8a4614b8abf764656c4b55f3bcc9fee60b642ed9701e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42BA 5768 bytes
font_01_sfnt_off0000563c.bin
0df7c88ba8e4353d005b560134c0f23549d9fcf34735d1ef4b3bb0d383cfc01a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x563C 9984 bytes

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