Malicious PDF — malware analysis report

Static analysis result for SHA-256 6126c418047cd38e…

MALICIOUS

PDF

43.0 KB Created: 2020-08-18 16:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 459a1bff55f61347c9d079b834229ee4 SHA-1: f5b7224fef115e62fac7c9554190e73e9d6f4b7f SHA-256: 6126c418047cd38e3eb5c76dc303a97edb0056c408ee96ef899fb502314efebf
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of embedded links, many of which point to PDF files hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to host or serve the final malicious payload.

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=boston+legal+theme+song
    • http://petino.stpaulpublicschools.org/uploads/1/3/0/8/130873826/jijavotabinip.pdf
    • http://nijinedo.whbaptist.org/uploads/1/3/0/7/130739564/nejiluvef_noruzifo_bedoriwi_fetakuduzenob.pdf
    • http://mimog.maudink.com/uploads/1/3/0/7/130776716/bokuvasetuluj.pdf
    • http://files.lacrestapoa.com/uploads/1/3/0/8/130813755/7941517.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3683/4981/files/lusufotazemesolebima.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/xanoxakuwisimiperi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1496/files/jexesededu.pdf
    • https://cdn.shopify.com/s/files/1/0438/9139/2664/files/esh_esc_hypertension_guidelines_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/4121/0011/files/76552371722.pdf
    • https://cdn.shopify.com/s/files/1/0431/3248/5793/files/age_of_empires_2_hd_demo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7556/7777/files/texejudo.pdf
    • https://cdn.shopify.com/s/files/1/0438/1189/7504/files/lorepovu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2478/4292/files/xanipebavorerosurase.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8821/files/liveboj.pdf
    • https://cdn.shopify.com/s/files/1/0437/5897/7178/files/barron_s_toeic_8th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0464/6574/5054/files/fourier_transform_infrared_ftir_spectroscopy_principle.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cf0.bin
27cff76b106d51c5847614c0f9a12b0007744651fbb6931107f4bd596d29cf94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CF0 5052 bytes
font_01_sfnt_off00005df4.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF4 1800 bytes
font_02_sfnt_off00006681.bin
130ba7a644ba9be1d12a3cbea5b6484eb0a0c8d1c8a71d63c91c83def18b8ab3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6681 9764 bytes
font_03_sfnt_off00008834.bin
682a406efcdf7dd49f9c494c129bca6394f160b3e372cc4ba493723cd6bcd7e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8834 16660 bytes

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