Malicious PDF — malware analysis report

Static analysis result for SHA-256 146066f5f518c815…

MALICIOUS

PDF

40.3 KB Created: 2020-08-15 02:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55315b1dc57e387af9dffdee4512b54a SHA-1: 2e066bab0a82a889b99ea6c6d0cee4cf12d5583a SHA-256: 146066f5f518c815dae25cd2d318a969ecd43e52fe36f486dcd5e1e95d5463f3
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 redirector service known to host malicious content. The primary malicious URL identified is ttraff.ru, which is associated with a link farm tactic. While the document body contains text related to 'inches to feet worksheet pdf', this appears to be a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

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=inches+to+feet+worksheet+pdf
    • http://files.en.hancbass-greaterswiss.com/uploads/1/3/1/6/131636625/1248662.pdf
    • http://files.merryvillemuseum.com/uploads/1/3/2/7/132710797/5249316.pdf
    • http://files.sharonreay.com/uploads/1/3/0/8/130813489/sejeforer_dupil_nalefubezasufew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/8402/7806/files/lojoxobakapaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/9215/5295/files/basic_electronics_components_details.pdf
    • https://cdn.shopify.com/s/files/1/0434/8585/5897/files/cateterismo_venoso_umbilical.pdf
    • https://cdn.shopify.com/s/files/1/0434/6816/1176/files/install_phantomjs_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7179/8436/files/41341431115.pdf
    • https://cdn.shopify.com/s/files/1/0435/4428/1247/files/how_to_recover_unsaved_word_document_2016.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7614/files/24669574972.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/buxidumex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50398535586.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/1757414799.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2051/files/45668670446.pdf
    • https://cdn.shopify.com/s/files/1/0435/9825/0146/files/august_month_current_affairs_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5265/files/84851287562.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_off00006015.bin
66e535a44b8b369af6c1b661863fe6cc0f85dbe4c46a9d8a7685abb5fd2dec26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6015 5092 bytes
font_01_sfnt_off00007171.bin
7e81a15859ac216379745ca474323b312a743107410d7269a541c75ae85bbb08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7171 10132 bytes

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