Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5c3d253119242c…

MALICIOUS

PDF

38.3 KB Created: 2020-07-24 14:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32c346fb0e16e30f9e0e274177d102e1 SHA-1: b8a270b7a2a49022f5cc7a8fd839d77f3eed2273 SHA-256: bd5c3d253119242cd147caa6db4d0cefdc771fca9945ec08f08edb118c6b859d
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf. The primary attack vector appears to be a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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/wb?keyword=timothy%20morton%20realist%20magic%20pdf
    • http://files.emmamcnairy.com/uploads/1/3/0/9/130968956/7541228.pdf
    • http://files.marydoogan.studio/uploads/1/3/1/4/131407855/laxemusowiwubi-donulosaduj-voturime-sobulonadawe.pdf
    • http://files.nmffa.org/uploads/1/3/0/9/130969819/deniz.pdf
    • http://files.emmamcnairy.com/uploads/1/3/0/9/130968956/7
    • https://cdn.shopify.com/s/files/1/0430/1737/1797/files/77324759108.pdf
    • https://cdn.shopify.com/s/files/1/0433/2018/0894/files/83298598435.pdf
    • https://cdn.shopify.com/s/files/1/0435/2914/2426/files/31762043617.pdf
    • https://cdn.shopify.com/s/files/1/0430/1658/5379/files/vefowofija.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7473/files/18068780121.pdf
    • https://cdn.shopify.com/s/files/1/0436/2236/7390/files/vobomuniv.pdf
    • https://cdn.shopify.com/s/files/1/0430/9811/2167/files/74920293568.pdf
    • https://cdn.shopify.com/s/files/1/0437/3217/2965/files/43094937431.pdf
    • https://cdn.shopify.com/s/files/1/0428/7057/1174/files/tebasopebevimomovo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37872338034.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3899/files/piluxaxejapevumiludaxo.pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f92.bin
eb1d3b4b7b3b8a2b26059f837fbcd2e8b500566522acfbd63442ecbc54d4ce84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F92 5408 bytes

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