Malicious PDF — malware analysis report

Static analysis result for SHA-256 68be7c111ffa84cc…

MALICIOUS

PDF

65.0 KB Created: 2020-07-29 06:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb265346d538ec224cc67fc44b83616b SHA-1: 4577bf4814c7b1be0e82b3e11ab03e5f2fae88c9 SHA-256: 68be7c111ffa84ccff4a5e7e7484b93a4606cd73cd22fa811fe544f93a65aa73
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO spam campaign. One of the primary links directs to a known malicious redirector, indicating a malicious intent to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=asco+guidelines+her2+2018
    • http://files.fremontbeertogo.com/uploads/1/3/1/8/131871583/reguvimuzagisobuj.pdf
    • http://files.makeitrainbitcoins.com/uploads/1/3/1/6/131606550/7981534.pdf
    • http://files.shcdesignsllc.com/uploads/1/3/1/4/131408170/5449577.pdf
    • http://files.activemindsucla.com/uploads/1/3/1/4/131453053/fegobelupubevelo.pdf
    • http://files.tankuanaw.com/uploads/1/3/1/3/131379612/eda4253071.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/3957/7496/files/pezunumonupokubifubozuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/3758/1734/files/52138731395.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5602/files/logekunogivevojuwapevi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/81667695053.pdf
    • https://cdn.shopify.com/s/files/1/0433/0265/0014/files/sisirufo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3050/3843/files/malusifusadajotekefive.pdf
    • https://cdn.shopify.com/s/files/1/0431/1384/0794/files/81733925903.pdf
    • https://cdn.shopify.com/s/files/1/0432/8688/8601/files/65855022843.pdf
    • https://cdn.shopify.com/s/files/1/0430/6970/2306/files/gagozoroxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wuwikeg.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/92736259033.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/77694104629.pdf
    • https://cdn.shopify.com/s/files/1/0435/4464/1695/files/pezejopepubojo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5655/4394/files/53564045963.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_off0000bfcd.bin
d5bb75b0d029dab2581822e7d1715715a1afec53446439c632c28b638da837f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCD 5300 bytes
font_01_sfnt_off0000d1b5.bin
9cb87ae578f1480cf72435cd0a3171fadd61975805828a870fd0fb9ed9bbf376		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B5 10988 bytes

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