Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4239b66d1c02f21…

MALICIOUS

PDF

39.4 KB Created: 2020-10-04 21:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b509b15a8c53ad624bece25ee941c968 SHA-1: 7546b6f2868abfe88ec38943e726527175bac3ea SHA-256: d4239b66d1c02f21fe208a1acc9bdc0a5c0f83e2d5cab9799688fbd406bfcf1a
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL 'https://cctraff.ru/strik?keyword=textbook+of+microbiology+for+dental+students+by+baveja' is directly associated with this malicious activity. The document body also contains other URLs that are likely part of the same distribution chain, suggesting a phishing or malware download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://cctraff.ru/strik?keyword=textbook+of+microbiology+for+dental+students+by+baveja In PDF document text
    • http://joxamifi.blvdpub.com/uploads/1/3/1/4/131410952/5122731.pdfIn PDF document text
    • http://lipep.mrslambsroom.com/uploads/1/3/1/4/131437252/1867971.pdfIn PDF document text
    • http://vutupemo.mainecla.org/uploads/1/3/0/7/130776167/fodoxuvedi_korunefilotilaj.pdfIn PDF document text
    • https://site-1041412.mozfiles.com/files/1041412/73009397096.pdfIn PDF document text
    • https://site-1037024.mozfiles.com/files/1037024/47866623665.pdfIn PDF document text
    • https://site-1048479.mozfiles.com/files/1048479/kazezivakize.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4677/2646/files/3327973129.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/20380641153.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8979/1643/files/89587099437.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000439a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x439A 5800 bytes
SHA-256: 24b809fffbaaedf000ffe370b1bffe6803e23306673d6d9ab302f35e6d1c24ed
font_01_sfnt_off00005755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5755 10000 bytes
SHA-256: bb90bc75860b0844e5599f5227a6fabd2d79b150f9c3d9586d13c3b2181d813c
font_02_sfnt_off000079b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79B7 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8