Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a93e7ba779b580…

MALICIOUS

PDF

33.5 KB Created: 2020-08-20 09:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2de1a8553c67048c21f894befbb5cc8 SHA-1: 8a446fd6edba883c76a19c953524ee41fc1005d2 SHA-256: 59a93e7ba779b580f32b3bf2e58ffeefd4ad5e9bd12850b4cf9ac9fea13aea68
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the primary malicious URL. The presence of a large number of external links, many pointing to seemingly unrelated PDF files, suggests a link farm or SEO poisoning tactic to obscure the malicious intent. No scripts were extracted from this sample.

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=copy+paper+5000+sheets+canada
    • http://files.bodyconfidenceaustralia.com/uploads/1/3/1/3/131379510/8238485.pdf
    • http://dorev.msvillwock.com/uploads/1/3/0/8/130813095/xopugudesamob.pdf
    • http://files.gsjministries.com/uploads/1/3/0/7/130776573/935417.pdf
    • http://files.shakespearefreelibrary.com/uploads/1/3/2/7/132740204/veduwoduvujapakobusi.pdf
    • https://cdn.shopify.com/s/files/1/0440/6735/6824/files/reading_comprehension_year_6_worksheets_free_uk.pdf
    • https://cdn.shopify.com/s/files/1/0431/8537/3333/files/18563600985.pdf
    • https://cdn.shopify.com/s/files/1/0448/0620/9702/files/d_d_5e_baldur_s_gate_descent_into_avernus_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/2356/3925/files/nukoxopexapopalut.pdf
    • https://cdn.shopify.com/s/files/1/0434/5420/2018/files/tanikosijebeki.pdf
    • https://cdn.shopify.com/s/files/1/0437/9662/7616/files/l_alchimiste_en_arabe.pdf
    • https://cdn.shopify.com/s/files/1/0436/5484/0485/files/26021997670.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/aircraft_weight_and_balance_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68906731860.pdf
    • https://cdn.shopify.com/s/files/1/0433/5960/0798/files/kekidosi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9878/files/energy_code_ace_trigger_sheets.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_off00004789.bin
4e225820d35f21177468c12cc57ea0097026f98b4acec251ecb10ae7b61d8100		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4789 5400 bytes
font_01_sfnt_off000059e7.bin
e59364f6a640a4e1cba917c8cf7b4b327248d03dddf0388432e77a1812f02606		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59E7 9244 bytes

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