Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b894d5ce3afa6b…

MALICIOUS

PDF

43.6 KB Created: 2020-08-08 20:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87edfd0abb48e4705155755fbb1f9f1f SHA-1: a53f047cf165e2bc145a36eaa0e41d8a89c9d156 SHA-256: 16b894d5ce3afa6b7a2295f71e1850d6afa17617dafe1a0724a458f6bcbeed83
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the embedded links and the nature of the heuristics point towards a malicious document designed for redirection.

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=go+away+big+green+monster+pdf
    • http://files.doggiedoodlesbydina.com/uploads/1/3/2/8/132815748/padibusobipe_zaxulax.pdf
    • http://files.dysfunctionalbmx.com/uploads/1/3/0/8/130814066/292ed8bba2b1.pdf
    • http://rowezojat.namicoloradosprings.org/uploads/1/3/2/3/132302782/videfamuzisujanuko.pdf
    • http://files.vvsahs.org/uploads/1/3/1/4/131437394/sudikalevabi.pdf
    • http://kinan.west-pro-installations.com/uploads/1/3/0/8/130873851/7168724.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/3006/7865/files/bufonetegod.pdf
    • https://cdn.shopify.com/s/files/1/0433/8994/3975/files/wevojipuwevowa.pdf
    • https://cdn.shopify.com/s/files/1/0430/2667/7913/files/xajap.pdf
    • https://cdn.shopify.com/s/files/1/0432/6955/4329/files/adjustment_computations_spatial_data_analysis_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/1771/4338/files/alternation_of_generation_in_archegoniate.pdf
    • https://cdn.shopify.com/s/files/1/0435/2471/8746/files/sukugonikedoxokutedub.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5354/files/wabuvuxopanasixurutaboru.pdf
    • https://cdn.shopify.com/s/files/1/0448/4897/1938/files/ccrt_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/7417/5644/files/78314755887.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4054/files/gavolufe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dokole.pdf
    • https://cdn.shopify.com/s/files/1/0431/2239/3244/files/28809551532.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_off0000693f.bin
76b20ef7bcfb9a246b60e94b10b8421431fcff133d1c5afb674f5f911872c5a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x693F 5692 bytes
font_01_sfnt_off00007ca2.bin
1b5625737c49849534e94f790131ee6865a576331e7f411dc148d11b2194cd42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA2 10660 bytes

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