Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f57f302baa9055…

MALICIOUS

PDF

41.1 KB Created: 2020-08-11 13:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b525518dfac6746e615034fa9436e8a6 SHA-1: 0e6f3aa15e4b3a0a784994f456dbeff501891ab1 SHA-256: c8f57f302baa90553bd2bc89d7ae7a31a36fd9177021c04d65ced0e9d5ec8490
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-Override

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body and embedded links suggest a link farm strategy, likely intended to lure users to malicious sites. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=bw3+menu+pdf
    • http://files.christianchildrensentertainment.com/uploads/1/3/1/3/131379183/tuwig-lidirepiw-mizikifalo.pdf
    • http://files.pianolessonsbyjulie.com/uploads/1/3/1/3/131380868/59baef08.pdf
    • http://files.trickhorse.net/uploads/1/3/2/6/132682134/3778318.pdf
    • https://cdn.shopify.com/s/files/1/0440/4566/4406/files/causas_da_anemia_falciforme.pdf
    • https://cdn.shopify.com/s/files/1/0429/8643/8807/files/uv_spectroscopy_working_principle.pdf
    • https://cdn.shopify.com/s/files/1/0437/5442/2423/files/5684584007.pdf
    • https://cdn.shopify.com/s/files/1/0437/7985/0398/files/fabagabiwexexoxig.pdf
    • https://cdn.shopify.com/s/files/1/0439/2216/1832/files/57600908449.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4703/files/rinidevabipatinezagaka.pdf
    • https://cdn.shopify.com/s/files/1/0431/5290/0250/files/tibafadotafivage.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/9709928187.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/towifisare.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/judezijewogifi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6329/files/62555385452.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_off000063cc.bin
05befe0414894d315c80932a53b0778ada9defa045f1d269539987c54eef3a62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63CC 4976 bytes
font_01_sfnt_off000074bc.bin
242a4f7cd692e08b73ee78bd823193e01935f8db4e312cdb888bf7e9caa12b11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74BC 10424 bytes

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