Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a22523d28754c7…

MALICIOUS

PDF

41.2 KB Created: 2020-08-13 22:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98d4e772c758d3b2bd0b2783a387760d SHA-1: 740de9e491679565325188652509c49e67f06598 SHA-256: 65a22523d28754c74fbb5a624c0ef94b9271568a9fa345e9d92eb085eec66203
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous links, with a critical heuristic identifying it as a malicious redirector link farm. The primary URL, https://ttraff.ru/pify?keyword=dotnet+new+from+template, is flagged as malicious and likely serves as a gateway to further malicious content. The document body, though heavily obfuscated, also contains this URL and other links to external PDFs, suggesting a multi-stage attack designed to lead the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=dotnet+new+from+template
    • http://files.olygarfieldpta.com/uploads/1/3/1/3/131379477/d3b5b167ee7.pdf
    • http://puwin.librariesofhopestore.com/uploads/1/3/2/7/132740405/sukunod-sabumasiwo.pdf
    • http://files.hightstownhsbands.org/uploads/1/3/1/8/131872070/tozuzuvixup.pdf
    • http://files.bigbearboardshop.com/uploads/1/3/1/6/131636612/pixuk.pdf
    • http://files.thehappyfits.com/uploads/1/3/0/8/130874676/f5819e9583a1587.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6906/3836/files/nuluwubepetibunukidopewa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0936/7461/files/joliset.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70686619693.pdf
    • https://cdn.shopify.com/s/files/1/0434/9765/2376/files/sodufolatemifit.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/advanced_glycation_end_products.pdf
    • https://cdn.shopify.com/s/files/1/0434/9345/8070/files/71252395001.pdf
    • https://cdn.shopify.com/s/files/1/0431/2704/6301/files/reribuwubow.pdf
    • https://cdn.shopify.com/s/files/1/0437/3849/7185/files/15547306366.pdf
    • https://cdn.shopify.com/s/files/1/0439/1793/4747/files/upsc_zoology_toppers_notes.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6238/files/38292797901.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_off0000651b.bin
e5c8d0169647e27a5eb1d58e44c116472f26b9547dce4ffd3a09d44860a17975		 pdf-font-stream PDF embedded font (sfnt) at offset 0x651B 4960 bytes
font_01_sfnt_off000075f5.bin
c9e0b9ec9c29113a2e3554fd8846853432050c46e5d1b5c069a51e853b7b86e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F5 9892 bytes

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