Malicious PDF — malware analysis report

Static analysis result for SHA-256 189998428f0b740d…

MALICIOUS

PDF

49.0 KB Created: 2020-08-08 03:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3df05df26a404a3e98479eae2e37985e SHA-1: ed943171ef7e4a333cb1ddc73bcdb74a6a05b4ae SHA-256: 189998428f0b740db46c688116b75373499dd99df47d59ca1866b978173723e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's part of a malicious redirector infrastructure. The primary malicious URL, 'https://ttraff.ru/pify?keyword=marketing+pdf+textbook', is designed to redirect users. The document body, though heavily obfuscated, contains references to 'marketing pdf textbook' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious link farm.

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=marketing+pdf+textbook
    • http://files.mendingtheshatteredmirror.com/uploads/1/3/0/7/130739369/xajumugipipe.pdf
    • http://zufimuxi.veradoverartist.com/uploads/1/3/0/8/130814297/jaforefekelisiw-memezekor.pdf
    • http://files.livelongerbetter.net/uploads/1/3/1/6/131637273/jufabod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0990/8637/files/24894264368.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5280/files/12680537726.pdf
    • https://cdn.shopify.com/s/files/1/0437/3485/9941/files/29611296589.pdf
    • https://cdn.shopify.com/s/files/1/0437/9112/2584/files/29626893169.pdf
    • https://cdn.shopify.com/s/files/1/0436/4324/0606/files/hatlyos_alaptrvny.pdf
    • https://cdn.shopify.com/s/files/1/0428/6893/2767/files/approbationsordnung_rzte.pdf
    • https://cdn.shopify.com/s/files/1/0435/6440/0798/files/89575821217.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/buwosufamaguvik.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1908/files/rs3_cooking_gauntlets.pdf
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/probiotic_bacteria_list.pdf
    • https://cdn.shopify.com/s/files/1/0428/2862/8135/files/45480640812.pdf
    • https://cdn.shopify.com/s/files/1/0430/0262/6202/files/aistear_learning_record_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/60087637457.pdf
    • https://cdn.shopify.com/s/files/1/0440/7646/6328/files/tepir.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c2d.bin
c01a3c2c0df4f42f429ad736fa66224ae4baa370a39a8f4e78ab5fab667f8d17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2D 5276 bytes
font_01_sfnt_off00007e41.bin
4fb9ba984744b00193f86a536562c43b4261baadad09176ed8697a51011daecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E41 10280 bytes
font_02_sfnt_off0000a124.bin
531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA124 16312 bytes

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