Malicious PDF — malware analysis report

Static analysis result for SHA-256 a871cff9c0a64f98…

MALICIOUS

PDF

50.9 KB Created: 2020-08-10 07:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cda94cd3075d881188d83586ebfae27 SHA-1: 339e57c087885d6efdb715552fe4c11d6a0e7e60 SHA-256: a871cff9c0a64f9804f5ec590632f6f15aa95997e9832fc892f1e204c9afb51f
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=agenda+21+onu+pdf+espa%25C3%25B1ol. The document body, though heavily obfuscated, also contains this URL and other links pointing to Shopify domains, suggesting a link farm or redirection tactic. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=agenda+21+onu+pdf+espa%25C3%25B1ol
    • http://files.fyimetrics.com/uploads/1/3/1/6/131606550/dusanal_sozafejojo_xusokana_jitog.pdf
    • http://dezirixe.blesscentmarketingcorp.com/uploads/1/3/1/6/131606490/4358475.pdf
    • http://wivizoba.genymama.com/uploads/1/3/0/8/130814328/wugufudun-gebalunemutoto-ruvif-tinaretanuri.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7905/files/wapiwesolatenuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5827/4205/files/kowiriruniv.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/vufosizemolo.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/beginning_algebra_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0439/0898/9096/files/the_economist_july_7_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6729/files/vifasevuzebifonitaretevu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1981/files/hollywood_movies_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/0096/2977/files/tinufosediluduxajuxij.pdf
    • https://cdn.shopify.com/s/files/1/0439/4123/2795/files/rijokajibakovifozewalom.pdf
    • https://cdn.shopify.com/s/files/1/0430/7245/4810/files/50104963375.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/2002_jeep_grand_cherokee_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/8697/0021/files/zifovujumoseki.pdf
    • https://cdn.shopify.com/s/files/1/0433/2837/2886/files/nufujomoxikesujoviloj.pdf
    • https://cdn.shopify.com/s/files/1/0440/7027/3174/files/c_sudoku_game.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_off000083fb.bin
c3e8a0c6fa8dbd723d025807d0a623da8754b506c0f057f58168d42b84a7863f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83FB 5500 bytes
font_01_sfnt_off00009694.bin
7f018db1c19acc41035e70723eccc58383b13be4125aa8629f3a38b3287e24c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9694 11668 bytes

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