Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b17bdea2230a75b…

MALICIOUS

PDF

45.8 KB Created: 2020-08-18 15:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a3fa27ad4fa128cdc011cb5fa42c167 SHA-1: df21f459db28393fd88e18cdede108e9720fc37a SHA-256: 6b17bdea2230a75bfeacd60e516d3630a983d609adeebb27fbbab458f66bf659
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=piano+concerto+no+1+tchaikovsky+sheet+music', indicating a probable phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to sheet music and the authoring application, likely serving as a lure.

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.com/pify?keyword=piano+concerto+no+1+tchaikovsky+sheet+music
    • http://files.themodestshoptx.com/uploads/1/3/0/8/130814535/sowitenije.pdf
    • http://files.wsfishfarm.com/uploads/1/3/1/3/131398406/57b709129.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0775/3888/files/71182377946.pdf
    • https://cdn.shopify.com/s/files/1/0429/8807/7209/files/88499660140.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1800/files/sabarimala_temple_images.pdf
    • https://cdn.shopify.com/s/files/1/0434/4122/5880/files/danaxiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5335/files/lord_of_scoundrels.pdf
    • https://cdn.shopify.com/s/files/1/0439/0617/1048/files/25761995545.pdf
    • https://cdn.shopify.com/s/files/1/0438/4342/0320/files/apoptosis_and_cell_death.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/memorandum_of_understanding_template_sale_of_business.pdf
    • https://cdn.shopify.com/s/files/1/0429/5249/1159/files/mumopobisepebavolago.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0503/files/bidirectional_visitor_counter_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/0225/7823/files/gunono.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_off00005273.bin
a2921aa0ff1f29453f2f812e21d7813cb31f467e8a6ec1bcbaa94daf41094fca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5273 5288 bytes
font_01_sfnt_off0000644a.bin
2cfbc3250dba50ad4a0696e3b37aca6a90e4c1570cae7e59cd62c08eef932b12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644A 14464 bytes
font_02_sfnt_off00009247.bin
f0d7227652c39c0ed3a674eb50801baccdef2bbf27cbfcf74ce440b78e632b52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9247 16184 bytes

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