Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1759f0dfdbb3fc…

MALICIOUS

PDF

39.9 KB Created: 2020-08-05 23:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a24a4c73b2bb9ac25a4e5b631bdec83e SHA-1: a9c4973a7c37c6932c92aa707182dd6a43184d27 SHA-256: fb1759f0dfdbb3fcda1056d4f2314ae0439d4a6f72a43de35c05455dfb028c71
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector pointing to 'https://ttraff.ru/pify?keyword=article+partitif+fle+pdf'. The presence of a link farm suggests an attempt to artificially inflate search engine rankings or distribute malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and embedded URLs are sufficient to infer a malicious redirection attack pattern.

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.ru/pify?keyword=article+partitif+fle+pdf
    • http://munawivol.arbutuspta.org/uploads/1/3/0/7/130739309/jakibekuna.pdf
    • http://files.rakshitestates.com/uploads/1/3/1/4/131453171/dowiwefo_levubasewafo.pdf
    • http://files.myguillermofloresuagro.net/uploads/1/3/1/4/131407067/duzuzanuxawomoz.pdf
    • http://suwixe.haptotherapiekoningsweg.nl/uploads/1/3/2/7/132741334/marejuled.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/77212896360.pdf
    • https://cdn.shopify.com/s/files/1/0437/2758/5445/files/noxolixivalufojomo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0985/9999/files/fularujubejumosejijuligu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4517/5971/files/matrix_screen_saver.pdf
    • https://cdn.shopify.com/s/files/1/0432/0365/7887/files/xasezomutimeniwixojejovuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/4356/8278/files/precalculus_with_limits_larson.pdf
    • https://cdn.shopify.com/s/files/1/0429/4728/1062/files/teratizuxatutugofa.pdf
    • https://cdn.shopify.com/s/files/1/0440/3711/1958/files/lebovulogekewoxuruf.pdf
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/calling_sehmat_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/61529944385.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0454/files/jemusunebizib.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_off00005e37.bin
d481be7eba92644dd62ba08ca734b918ebc333c59d1b452a448906b8e17a6efe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E37 4960 bytes
font_01_sfnt_off00006f2c.bin
e4f8a8d93b2cb43680c261dc1598c6a78a902762c1d4d62878ac8fad24bd610b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2C 10500 bytes

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