Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfeff1be2762b03…

MALICIOUS

PDF

36.6 KB Created: 2020-08-05 15:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf5a5bbbb0b44c55822a1414afa2e229 SHA-1: f938ef97b3fabaf5bde08cda51c35b1bf0d072f7 SHA-256: 6bfeff1be2762b032fca7d911524562d5c99f760d55e04776ae124cd824bb4c9
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to what appears to be a link farm designed to manipulate search engine results. One prominent URL, https://ttraff.ru/pify?keyword=broken+vessels+hillsong+lyrics+and+chords+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF files hosted on Shopify, suggesting a phishing or SEO manipulation 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.ru/pify?keyword=broken+vessels+hillsong+lyrics+and+chords+pdf
    • http://files.lookupclearwater.com/uploads/1/3/0/7/130775150/d0230cdfd530b.pdf
    • http://files.rexingsuper4th.com/uploads/1/3/0/7/130738955/292d17b7a2.pdf
    • http://files.colbycenterfordance.com/uploads/1/3/2/6/132681826/70e1e27b54a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/filubalezis.pdf
    • https://cdn.shopify.com/s/files/1/0435/3431/9776/files/58544519167.pdf
    • https://cdn.shopify.com/s/files/1/0432/2692/3172/files/46783693465.pdf
    • https://cdn.shopify.com/s/files/1/0431/0908/9447/files/nusuvilebuwoma.pdf
    • https://cdn.shopify.com/s/files/1/0435/2229/3920/files/36500498036.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2125/files/33256646374.pdf
    • https://cdn.shopify.com/s/files/1/0434/0344/4380/files/resemovixogur.pdf
    • https://cdn.shopify.com/s/files/1/0428/0900/0103/files/99294364746.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/tixutafifuxix.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/30452759725.pdf
    • https://cdn.shopify.com/s/files/1/0431/9671/1073/files/95047588665.pdf
    • https://cdn.shopify.com/s/files/1/0434/6354/0902/files/99005251253.pdf
    • https://cdn.shopify.com/s/files/1/0433/6202/5624/files/15041168707.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_off00004923.bin
983e2723b352ac36991b02c50cd14051c413793d1771b3ac0e4d58595c312e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4923 5692 bytes
font_01_sfnt_off00005c97.bin
841a76272df3d3a01324621b2147cb2c23f178d491a555ce5ffc25999b126025		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C97 13136 bytes

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