Malicious PDF — malware analysis report

Static analysis result for SHA-256 17876eb03cf50b95…

MALICIOUS

PDF

34.4 KB Created: 2020-08-08 22:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 169cfd9a3b5dae0426b920bbb4968053 SHA-1: e97bc9fc14e425841f8482b43c55fad4b84f7b0b SHA-256: 17876eb03cf50b95c695ecebdbdd8f7cd51bbdc705c839af5c511fae0033467f
154 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to SEO-optimized PDF files hosted on various domains, suggesting a link farm for search engine manipulation. One prominent URL, 'https://ttraff.ru/pify?keyword=simile+and+metaphor+worksheet+1+pdf+answers', is identified as a malicious redirector. The document body, though partially corrupted, contains text related to a worksheet and the authoring application 'wkhtmltopdf', indicating a potential lure to disguise malicious activity. The ML classifier strongly flagged this PDF as malicious.

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=simile+and+metaphor+worksheet+1+pdf+answers
    • http://files.artsplacecheshirect.org/uploads/1/3/0/9/130969322/58cdc.pdf
    • http://files.413classifieds.com/uploads/1/3/1/3/131380786/2659077.pdf
    • http://nuxowi.tracitrue.com/uploads/1/3/2/6/132695569/8833245.pdf
    • http://files.shelburneprimrose.com/uploads/1/3/1/4/131406758/fobitozijeneba.pdf
    • http://files.rickywhitemore.co.uk/uploads/1/3/0/9/130969048/7865030.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99913566500.pdf
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/56715527350.pdf
    • https://cdn.shopify.com/s/files/1/0431/6577/8076/files/lodivaposujepipamipax.pdf
    • https://cdn.shopify.com/s/files/1/0431/4752/6305/files/fivisinazazuximopigom.pdf
    • https://cdn.shopify.com/s/files/1/0439/1727/9400/files/gepotinutawoli.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sovonuvebapade.pdf
    • https://cdn.shopify.com/s/files/1/0431/9644/8917/files/98480974306.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/pinodevo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9087/0423/files/sikamubezov.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/wimsatt_beardsley_intentional_fallacy.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_off00004aa8.bin
c1d94f6b48eb38d0da954611fd317da683dcc7ddc474ce0c5b9b70d387a55af1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AA8 5592 bytes
font_01_sfnt_off00005d8f.bin
b7364afd04a27d5bca1a720df7c3a61e28ba2da66791518e6ea18b5013d21bc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8F 9096 bytes

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