Malicious PDF — malware analysis report

Static analysis result for SHA-256 38dd831b9fc8f89d…

MALICIOUS

PDF

38.0 KB Created: 2020-08-12 00:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab1e142a832ab82078be7c3236b08213 SHA-1: fd5016c1333925196d3425dc9b96838b6b103424 SHA-256: 38dd831b9fc8f89d3ec9734384d6b932f6bccb1a75975a390408b5cb486b734c
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a tactic to disguise malicious activity within a seemingly benign link farm, ultimately leading users to harmful infrastructure. 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.cc/pify?keyword=pdf+journal+marketing+management
    • http://files.chenowethbairddesign.com/uploads/1/3/1/8/131871894/kawal_fudomur.pdf
    • http://files.n2everything.com/uploads/1/3/0/8/130813317/diminupapuxufak-zoxanakisogi-metemosane-logarobuze.pdf
    • http://files.thoreauwayensemble.org/uploads/1/3/2/6/132681308/1790876.pdf
    • https://cdn.shopify.com/s/files/1/0432/8164/5736/files/mappa_turistica_bolzano.pdf
    • https://cdn.shopify.com/s/files/1/0437/7909/6728/files/simple_binary_tree_program_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/37604868145.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/47994193515.pdf
    • https://cdn.shopify.com/s/files/1/0437/8161/9861/files/17828533674.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/lofudomekub.pdf
    • https://cdn.shopify.com/s/files/1/0434/5220/3161/files/verizon_channel_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tutokufumetuja.pdf
    • https://cdn.shopify.com/s/files/1/0439/5122/7048/files/58010701009.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0066/files/jukegamik.pdf
    • https://cdn.shopify.com/s/files/1/0435/5339/0743/files/kojedetojax.pdf
    • https://cdn.shopify.com/s/files/1/0435/3835/0231/files/cdf_and_matlab.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_off0000548a.bin
e449a2f46045e2264a3bcda61d7961159a6b77dc55531c2cbe77a4d51aff60eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x548A 5188 bytes
font_01_sfnt_off00006628.bin
3cfba0ec63393a5939be7b80881077b5a176a27bfd2bdff493f4ff2edcfb653a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6628 11152 bytes

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