Malicious PDF — malware analysis report

Static analysis result for SHA-256 7838ccd57f690ad1…

MALICIOUS

PDF

40.2 KB Created: 2020-07-30 09:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d34e95fecdd5e65193795f800f0f8c2d SHA-1: 90fd0084ff60838a4f2527f177624b944e254564 SHA-256: 7838ccd57f690ad1ae062066de9af5a133499f028b6d43401188f09758da3b7c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a link farm designed to host numerous SEO-optimized PDF documents, with the primary link redirecting to a known malicious URL. The ML classifier strongly indicates malicious intent, and the document body's reference to an "Avon brochure" suggests a phishing or scam lure. The embedded links and the nature of the PDF structure point towards an attempt to distribute malware or lead users to malicious content.

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=avon+brochure+june+2020+pdf
    • http://files.thegintinbar.co.uk/uploads/1/3/0/8/130813921/kizizibu.pdf
    • http://files.greateraustinsws.com/uploads/1/3/0/7/130775304/5e3f48.pdf
    • http://files.msaspinall.com/uploads/1/3/1/4/131438234/vebulejido_taxoletusej_gisosesuj.pdf
    • http://files.chichomeinterior.com/uploads/1/3/0/9/130969876/rigoropabowap_xemer_kuzosel_wuwipimutid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/31389484216.pdf
    • https://cdn.shopify.com/s/files/1/0430/2949/5959/files/jegaloxadajesofif.pdf
    • https://cdn.shopify.com/s/files/1/0438/2710/1853/files/40287760702.pdf
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/89912555515.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/27587503899.pdf
    • https://cdn.shopify.com/s/files/1/0433/7955/6504/files/95448464916.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mirizopenifipometetotagoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/3004/5084/files/kixezidixanifelufufinik.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7569/files/zetoziroteguririroferofo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/julesomeromajubibazegowel.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6780/files/20820723679.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_off00006071.bin
5c3cf63e1082f3a92f2eed719c64761273f9c964b0d58a32d047afb74f1c20ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6071 5116 bytes
font_01_sfnt_off000071d4.bin
a56c024aabd2c8268436ea0bdb40e5b368af5969bab6db6b563546ca0c2f97ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D4 10044 bytes

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