Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b8d13a60c8f1f9…

MALICIOUS

PDF

45.8 KB Created: 2020-08-14 19:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb03dffea2ea7ddb60d13244d4158caa SHA-1: db250d7dca196c07ede86ce0de7f7bfe2afd4894 SHA-256: 18b8d13a60c8f1f95b71a9ca2e7d16f2110e5db0ecd38c9b793069a5fe0eddb8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=agenda+meeting+sample+pdf'. Additionally, it exhibits a PDF link farm heuristic, embedding numerous external PDF links, many of which point to Shopify-hosted files. The ML classifier also strongly indicated maliciousness. These factors suggest the document's primary purpose is to lure users to malicious sites.

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=agenda+meeting+sample+pdf
    • http://files.tcmrestoration.net/uploads/1/3/1/4/131407067/nubujisukuvapi.pdf
    • http://files.vandersystreefarm.com/uploads/1/3/1/4/131406811/roxudef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/70003428011.pdf
    • https://cdn.shopify.com/s/files/1/0430/0714/8185/files/night_by_elie_wiesel_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/1861/5975/files/emdeko_sewing_machine.pdf
    • https://cdn.shopify.com/s/files/1/0436/3019/8937/files/muzazokuweradamarajig.pdf
    • https://cdn.shopify.com/s/files/1/0428/4848/5535/files/22252033179.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/23601341822.pdf
    • https://cdn.shopify.com/s/files/1/0432/0244/5475/files/bogetuwig.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/vakukoduguvi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2678/4157/files/jazipevaxuvabu.pdf
    • https://cdn.shopify.com/s/files/1/0439/4126/5566/files/zuburigixezijaxolekatisuf.pdf
    • https://cdn.shopify.com/s/files/1/0435/5653/6479/files/sokakufoseroviloweja.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6123/files/61631732146.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_off0000756f.bin
f29802f04846f965bfdb3998c663bd9af818ae4b760946005407367d59768af7
pdf-font-stream PDF embedded font (sfnt) at offset 0x756F 5256 bytes
font_01_sfnt_off00008741.bin
2d26a332cafe410b981b7bc1991d7a2a4c1d8452e72cce26845fcd839146c1b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8741 10296 bytes