Malicious PDF — malware analysis report

Static analysis result for SHA-256 839ced1707bca74a…

MALICIOUS

PDF

43.5 KB Created: 2020-08-10 10:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c64d185222f2e1b36837c698d1b5aa2c SHA-1: e8c10359460974fe5cc73581ee2e27b393caff10 SHA-256: 839ced1707bca74a279ecd2f09de66ba09e8f5c82773905253954f9789845d2c
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 pointing to benign Shopify domains, but one critical link directs to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=physics+formula+sheet+pdf', suggesting a lure to disguise malicious activity. The ML classifier also strongly indicated maliciousness.

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=physics+formula+sheet+pdf
    • http://files.mroodwebsite.org/uploads/1/3/1/3/131384121/mojuboros-nalivubofalasex.pdf
    • http://files.jollyduke.com/uploads/1/3/0/7/130775205/6244228.pdf
    • http://gifafev.kellytuckercreates.com/uploads/1/3/2/8/132814930/3852318.pdf
    • http://files.stevenjayclarke.com/uploads/1/3/1/4/131406826/6c658cc941158c8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/smallest_reader_app.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7002/files/irritable_bowel_syndrome_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1357/files/fiboduzapajorafedifuxef.pdf
    • https://cdn.shopify.com/s/files/1/0433/7539/4977/files/51973434506.pdf
    • https://cdn.shopify.com/s/files/1/0430/9286/9281/files/sakodof.pdf
    • https://cdn.shopify.com/s/files/1/0445/8083/1396/files/57640741379.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27150836515.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/xelexuwimovidujuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2662/files/calculus_a_complete_course_robert_adams.pdf
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/farefemukepinakovidozil.pdf
    • https://cdn.shopify.com/s/files/1/0431/3877/7249/files/58718067505.pdf
    • https://cdn.shopify.com/s/files/1/0434/9090/2166/files/giwuruwugekabune.pdf
    • https://cdn.shopify.com/s/files/1/0432/2305/6545/files/high_school_english_grammar_book.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_off00006bf1.bin
9b5bcbf70518ba561eeca532eda31d12bbe43a59814636f8bd3b8cbb65a5c26c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF1 5496 bytes
font_01_sfnt_off00007e82.bin
e54c12502979f36b4443fae9d1b88b4cf32774f3681a2fbe91e3f34eddf82669		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E82 10124 bytes

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