Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8730ecad03709d8…

MALICIOUS

PDF

38.9 KB Created: 2020-07-30 07:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c44f65fca7a6401540c2d76570e2dfaa SHA-1: 5eb7be5755a7a7892a330130225f65471de736bb SHA-256: a8730ecad03709d809c82ed5dc0e43968f60fbc98ac05ea13cce328b2093f357
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a link farm designed to appear as search results for technical documents, specifically 'Autocad electrical drawings for practice pdf'. This link redirects to a malicious URL (ttraff.cc), indicating a phishing or malware distribution attempt. The ML classifier strongly supports the malicious verdict, and the PDF structure is consistent with SEO-based lures.

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=autocad+electrical+drawings+for+practice+pdf
    • http://files.kelvynkoning.com/uploads/1/3/1/6/131606003/kuzaridawuzenefaxes.pdf
    • http://files.franklininternationalbeautystore.com/uploads/1/3/1/3/131380485/vedajojanuroso.pdf
    • http://files.willcrooke.com/uploads/1/3/1/6/131606201/82db5f9.pdf
    • http://files.kelvynkoning.com/uploads/1/3/1/6/131606003/kuzaridaw
    • https://cdn.shopify.com/s/files/1/0432/3124/8539/files/88090184688.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/gexulurot.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/getedopoxow.pdf
    • https://cdn.shopify.com/s/files/1/0435/4339/6506/files/49394267946.pdf
    • https://cdn.shopify.com/s/files/1/0434/0160/9366/files/15103517535.pdf
    • https://cdn.shopify.com/s/files/1/0428/9570/4227/files/kezazenaxewofe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3782/files/mozazijelotimupo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27392185694.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0430/6957/1233/files/rozarofizujebof.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/92530996665.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/91159557079.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81603963226.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_off00005b70.bin
ba89f8b9cd7af325ae9316f541dca2280f678311287875b2ea8e0bb970092f9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B70 5284 bytes
font_01_sfnt_off00006d87.bin
7e3e27db2596ac98cdfa90ff8b47da1b5ab5fa5ae263d05da0fd2c8cc78d9031		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D87 9660 bytes

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