Malicious PDF — malware analysis report

Static analysis result for SHA-256 a377104e25cc8335…

MALICIOUS

PDF

42.4 KB Created: 2020-08-13 23:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4c8f4a12f9cdb682b4210268e17da4e SHA-1: 276862d3f0b26e11d3a387b7bfe8616a94b499bd SHA-256: a377104e25cc8335da92844ff252c47e481ded86fff41e224dacd2874a3b8f0b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, with one prominent link pointing to a known malicious redirector. The document body, though partially corrupted, contains text referencing 'Codeigniter 4 guide' and the PDF creation tool 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the presence of malicious redirector links.

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=codeigniter+4+guide
    • http://files.andreas-skincare-bodytherapy.com/uploads/1/3/1/3/131379477/ximegidozubi-pedugukawometeg-natusixe.pdf
    • http://files.thedancingdivas.net/uploads/1/3/1/6/131606397/filugedux-savomidu.pdf
    • http://files.eveningshadeshibas.com/uploads/1/3/1/4/131483214/e926a6add.pdf
    • http://files.metrolifesafety.com/uploads/1/3/1/8/131871605/ravurajok-wapef.pdf
    • http://files.exmouthcaninecentre.co.uk/uploads/1/3/0/8/130874128/jenasaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/6909/5590/files/702388930.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/lunowoxasip.pdf
    • https://cdn.shopify.com/s/files/1/0430/6288/6554/files/bioplastic_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/84462129027.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/fodasutijiwadumenuneb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nudukesobiji.pdf
    • https://cdn.shopify.com/s/files/1/0436/7892/4953/files/53606184359.pdf
    • https://cdn.shopify.com/s/files/1/0438/2890/4093/files/97498207835.pdf
    • https://cdn.shopify.com/s/files/1/0438/2975/6066/files/susukemokew.pdf
    • https://cdn.shopify.com/s/files/1/0450/2038/1342/files/encyclopedie_medico_chirurgicale_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0813/files/98591449817.pdf
    • https://cdn.shopify.com/s/files/1/0430/3847/4397/files/caderno_de_caligrafia_para_imprimir_em.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006921.bin
f9e61e18f195cc4552c6af416ed8ddd86f4fbef17dca01f40f9cef774829e800		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6921 4564 bytes
font_01_sfnt_off000078c2.bin
83399a599239f05a0d76f1ce21151a0f49d137ed1c3c744d5911a7a8b3690aa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C2 10608 bytes

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