Malicious PDF — malware analysis report

Static analysis result for SHA-256 723c7ab28c718c7e…

MALICIOUS

PDF

40.5 KB Created: 2020-08-13 15:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81579a9038612aa7adec1e81e473b83e SHA-1: 314b07ed8462df10c1b779146a227977fa0e5bee SHA-256: 723c7ab28c718c7eac0c217f463c4091952726121d7d32d3afcb407cd1709932
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=aristoteles+pdf+unam'. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated, but the presence of embedded URLs suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=aristoteles+pdf+unam
    • http://files.hikaricreative.net/uploads/1/3/0/7/130739764/8723732.pdf
    • http://files.woodcraftbybean.com/uploads/1/3/2/6/132696128/f9446121f.pdf
    • http://gagade.visitgoringandstreatley.co.uk/uploads/1/3/1/0/131070786/tiwowogijipeti.pdf
    • http://files.milecreekfarmsixmilesc.com/uploads/1/3/1/0/131070144/e5f870807.pdf
    • http://files.williamsburgrec.com/uploads/1/3/2/6/132682745/tagogumolizim_fofuzipupi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4258/5241/files/mathematics_textbook_for_university.pdf
    • https://cdn.shopify.com/s/files/1/0432/1152/2209/files/fasuvulerugeranisawexe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7346/1669/files/20076725646.pdf
    • https://cdn.shopify.com/s/files/1/0435/7154/4225/files/zerodha_varsity_technical_analysis_download.pdf
    • https://cdn.shopify.com/s/files/1/0443/4948/9308/files/atividades_de_alfabetizao_para_imprimir_em.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5460/files/antony_and_cleopatra_themes.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6977/files/43021701572.pdf
    • https://cdn.shopify.com/s/files/1/0432/4248/7963/files/ultimo_edital_da_prf.pdf
    • https://cdn.shopify.com/s/files/1/0439/4975/2478/files/sumepebikuvifasadif.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/mozaxemajubu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4590/3774/files/c_open_text_file.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005edf.bin
5e429c4f4ee310fad18fe2faafdde582925b0f10c83d2b1eedc6d92f427c950d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDF 5176 bytes
font_01_sfnt_off00007060.bin
6427d413a9eff5ad72af34725219cd6deb698af1ae6610445cbcc18a99c07280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7060 11164 bytes

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