Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a90fe120ec611e…

MALICIOUS

PDF

50.3 KB Created: 2020-08-19 23:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0373344688baba022e98d67e4cae9d0b SHA-1: a77de4181eb9b51df4cafb6196c9272c5ad63759 SHA-256: 31a90fe120ec611e07e3293f6dad6e7c870ca74344002c7fa6214a4a7baca459
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 of which point to domains associated with link farms and redirectors. The primary malicious URL identified is https://ttraff.ru/pify?keyword=quadratic+interpolation+method+in+optimization+pdf, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a social engineering attempt to direct users to malicious content.

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=quadratic+interpolation+method+in+optimization+pdf
    • http://povubafax.brunswicknaturesculpturewalk.com/uploads/1/3/2/8/132814930/wusomofori.pdf
    • http://kilekedo.ccrid.info/uploads/1/3/0/7/130738524/velaxukogezojasi.pdf
    • http://files.completehealthcareok.com/uploads/1/3/0/8/130813588/fofenabajes.pdf
    • http://files.lucianamagdalena.com/uploads/1/3/2/3/132302944/a4341e567fc0f27.pdf
    • http://files.mooderopah.co.uk/uploads/1/3/1/3/131398360/turox.pdf
    • https://cdn.shopify.com/s/files/1/0431/3638/5181/files/50640086305.pdf
    • https://cdn.shopify.com/s/files/1/0430/2582/5955/files/20306318014.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fiwowosilikaragufes.pdf
    • https://cdn.shopify.com/s/files/1/0433/8909/1998/files/kidusiposenisamu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2394/files/36824054614.pdf
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/list_of_regular_and_irregular_verbs_in_past_simple.pdf
    • https://cdn.shopify.com/s/files/1/0434/4437/1613/files/problem_solving_theory_in_social_work.pdf
    • https://cdn.shopify.com/s/files/1/0432/6457/3593/files/job_template_for_project_manager.pdf
    • https://cdn.shopify.com/s/files/1/0428/2823/4908/files/xatepor.pdf
    • https://cdn.shopify.com/s/files/1/0431/0990/8637/files/sistem_informasi_akademik_unsri._ac._id.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006234.bin
7b69bdae7f06e1699fc550c5ca4ab23d78d069727b81c5a7d6a649b59a96453d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6234 5208 bytes
font_01_sfnt_off000073bc.bin
8427211bfcfdf7ab68070bab161bea811b02a131ab2b19a607f8244c3b1122de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73BC 10804 bytes
font_02_sfnt_off000098e4.bin
84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98E4 16060 bytes
font_03_sfnt_off0000ad77.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD77 4324 bytes

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