Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f99412b5a0a2d18…

MALICIOUS

PDF

39.3 KB Created: 2020-08-25 17:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02bb5b42a7bf77a0521bff062494f8c2 SHA-1: aadfd9b1a723134ddbb87518c6388d532311ddb2 SHA-256: 0f99412b5a0a2d1877af5f7584cca5ecab22b068e1aa2f296924f8b8e1d15826
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to potentially malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of this redirection scheme.

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=purble+place+online
    • http://files.thesummitplayhouse.org/uploads/1/3/0/7/130739140/mekuvizon.pdf
    • http://files.tinabresil.com/uploads/1/3/1/3/131398008/fa82906a.pdf
    • http://gekozewe.beansplaybox.com/uploads/1/3/2/8/132814930/db767b.pdf
    • http://sizapemoj.beautifulboutique.org/uploads/1/3/1/4/131406687/bd6a53f607177.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7229/8918/files/57568545562.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7982/files/inform_educate_entertain.pdf
    • https://cdn.shopify.com/s/files/1/0434/0563/9836/files/global_ecological_footprint.pdf
    • https://cdn.shopify.com/s/files/1/0452/4458/0002/files/class_12_biology_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9028/8535/files/41794532932.pdf
    • https://cdn.shopify.com/s/files/1/0432/1650/2939/files/book_report_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/1938/6526/files/malepu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/lisuregakizanupoxitir.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/adverbial_phrase_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0436/4910/6080/files/antichrist_movie_in_tamil_dubbed.pdf
    • https://cdn.shopify.com/s/files/1/0431/6446/7357/files/95623290757.pdf
    • https://cdn.shopify.com/s/files/1/0434/9083/6632/files/sunufosekuzopapaji.pdf
    • https://cdn.shopify.com/s/files/1/0440/0034/6270/files/adobe_acrobat_reader_word_to.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_off00005d45.bin
c1100ac24b15870ecee1252a4b8d9c4a953177052172a2338bbe3c7e2836d4f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D45 4892 bytes
font_01_sfnt_off00006deb.bin
e6cc7c23c4dac1dd2acdc3cfa60ff53fcff0f68e125123596a2c15d20ce6ca7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEB 10488 bytes

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