Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38d51f9921ca4b4…

MALICIOUS

PDF

48.3 KB Created: 2020-08-17 14:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6fe45004c459dd2c5dcf00a8cc34e5f SHA-1: 58ce556b36eca0931cc77e2ddfb670f383d18a59 SHA-256: d38d51f9921ca4b4c3a4013e9f391ac16038e318474bdd2869213d130932ad57
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=el+alienista+pdf+gratis'. Additionally, it exhibits a PDF link farm behavior, embedding numerous external links, many of which host PDF files. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to a malicious site under the guise of providing a free PDF.

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=el+alienista+pdf+gratis
    • http://files.eyelashogden.com/uploads/1/3/2/3/132303138/5374281.pdf
    • http://matuxe.tranquilmomentsskincare.com/uploads/1/3/1/4/131406427/c935ab745757b2.pdf
    • http://sirujese.tamra-davis.com/uploads/1/3/1/6/131637395/lonavekap.pdf
    • http://bexiw.shellystill.co.uk/uploads/1/3/1/8/131871899/jetowogatama_memetepikiwesag_vutebuxudet.pdf
    • http://files.gamedaytraining.net/uploads/1/3/2/8/132815063/nuwewim.pdf
    • https://cdn.shopify.com/s/files/1/0430/7301/1863/files/ilocano_orthography.pdf
    • https://cdn.shopify.com/s/files/1/0429/7110/3395/files/93198925705.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/xawezozawuxa.pdf
    • https://cdn.shopify.com/s/files/1/0439/9231/8110/files/83983570353.pdf
    • https://cdn.shopify.com/s/files/1/0438/3988/1376/files/quimica_inorganica_concepto.pdf
    • https://cdn.shopify.com/s/files/1/0440/0008/4126/files/important_full_forms_of_science.pdf
    • https://cdn.shopify.com/s/files/1/0432/2597/2904/files/javascript_anonymous_function.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/xuwipi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007239.bin
92177f7f54de93af3653c608eec12b888a0bc0dbbc1462697e971788b5dc0518		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7239 4844 bytes
font_01_sfnt_off000082b6.bin
2f129543fc9727c831f3154315397ec50d5e433351fb58f1167dfc97c5eda940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82B6 10944 bytes
font_02_sfnt_off0000a6a2.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6A2 4324 bytes

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