Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2493e69c96ca33…

MALICIOUS

PDF

40.6 KB Created: 2020-08-20 18:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbc88d65ca6bd53f33368784497fb682 SHA-1: a03c12dab4d2be4bdffdddeb920a44220045025d SHA-256: 0f2493e69c96ca333dbeb19ada841d422317c203cf8db4b0668c47be0571dfe5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of these links, 'https://ttraff.ru/pify?keyword=formal+synonym+for+ironically', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, suggesting an attempt to disguise malicious activity.

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=formal+synonym+for+ironically
    • http://files.romuluseducation.com/uploads/1/3/1/8/131856632/6be124590ab.pdf
    • http://files.willowoodfurniture.com/uploads/1/3/2/6/132695351/19998273d.pdf
    • http://files.transformingliveschurch.org/uploads/1/3/1/3/131383483/8078296.pdf
    • http://files.cyprustrackxc.com/uploads/1/3/1/3/131382590/favebigogop.pdf
    • http://gixiwu.ctband.org/uploads/1/3/1/4/131437987/952f84.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7668/0869/files/streamline_english_connections_workbook_b.pdf
    • https://cdn.shopify.com/s/files/1/0428/8312/1319/files/bpmn_2._0_notation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/9041/8591/files/tracker_boats_owners_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0434/4876/2529/files/most_common_idioms_and_phrases_with_meanings_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0438/3866/8965/files/free_reading_comprehension_worksheets_year_5.pdf
    • https://cdn.shopify.com/s/files/1/0438/8116/9051/files/65638452808.pdf
    • https://cdn.shopify.com/s/files/1/0431/8973/1479/files/54516225046.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91146339154.pdf
    • https://cdn.shopify.com/s/files/1/0431/1112/1057/files/muzibolukipofenisoja.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6152/files/kogajitozurokebuzosop.pdf
    • https://cdn.shopify.com/s/files/1/0431/1017/0786/files/bokixutemafavodikumisob.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_off00005f23.bin
4d311870d608dd8f782b2188c8e811b4afa568baa5bda708cb943cceb4b4d3ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F23 5084 bytes
font_01_sfnt_off00007059.bin
1bc474b412222bba3293bf94823f5d852830e4bf42a554824ee27a396016f4ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7059 10540 bytes

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