Malicious PDF — malware analysis report

Static analysis result for SHA-256 6630b21b4cdb4d0f…

MALICIOUS

PDF

41.3 KB Created: 2020-08-18 17:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8728c85c5f071b8ca195348fc3c03392 SHA-1: 9bd2cad3ddcc3951b7726221f9a1d96ddd0d33c6 SHA-256: 6630b21b4cdb4d0facf5fbe0312eb9b025aaa9fdef1b48b99f1791c757faa2d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to a redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=illustration+essay+outline+template, which is likely used to obscure the final destination. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly indicated maliciousness.

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=illustration+essay+outline+template
    • http://files.ggspdt.com/uploads/1/3/1/4/131437711/3384185.pdf
    • http://files.ahealthybalance.ca/uploads/1/3/2/6/132682564/xeguvomakeralab.pdf
    • http://files.houseofaromas.online/uploads/1/3/0/9/130969440/pupipa_kakikufafumoso_getovefu.pdf
    • http://dewowu.yourcbshop.com/uploads/1/3/1/1/131164250/5ca54ec7dd46.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/32224703074.pdf
    • https://cdn.shopify.com/s/files/1/0428/5467/8687/files/3011707097.pdf
    • https://cdn.shopify.com/s/files/1/0435/2072/1055/files/95549446701.pdf
    • https://cdn.shopify.com/s/files/1/0434/9765/2376/files/busubererosu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6706/1925/files/sitelalumizigosiziwugamoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/isoflavonas_de_soya.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/24660876003.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6710/files/mibolegadojoxut.pdf
    • https://cdn.shopify.com/s/files/1/0433/4642/8062/files/ruwut.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_off000066a4.bin
4fc14c46d72f1f4c513684c74bc9ef120a646f9e3141628d19171075924ef1f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x66A4 5004 bytes
font_01_sfnt_off0000778d.bin
a72d8f3745a54f8f1a0bb9ad8d44ac70be3c2a56cca18f5ff34044ee36f5148a
pdf-font-stream PDF embedded font (sfnt) at offset 0x778D 9688 bytes