Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4c14b8601f3684…

MALICIOUS

PDF

114.8 KB Created: 2020-08-09 09:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2acd0005b04491c47ae164849411225b SHA-1: 429d537fca6b7ee084da81929ad99500e40ddb29 SHA-256: 6c4c14b8601f3684f7a91e5c3b76385b2a66b2aae8c2ae85b263a96e62323e95
194 Risk Score

Malware Insights

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

This PDF file contains a link disguised as a thesis on air pollution, which redirects to malicious infrastructure. The PDF also includes a large number of links to other PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates an attempt to deliver a secondary payload or lead the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.com/pify?keyword=contaminacion+del+aire+pdf+tesis
    • http://files.dougwedge.com/uploads/1/3/1/4/131437593/wudew-kalurebof-damafuwawelovo.pdf
    • http://files.companionsofchrist.org/uploads/1/3/0/9/130969375/3234800.pdf
    • http://nipivod.erinmicklow.com/uploads/1/3/0/8/130814328/2162244.pdf
    • http://files.ustars.org/uploads/1/3/2/8/132814196/fibal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6512/1699/files/men_in_black_megavideo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9640/8218/files/lufivatalutelata.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/30218299477.pdf
    • https://cdn.shopify.com/s/files/1/0440/8092/2789/files/husqvarna_chain_saw_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8225/2442/files/biraluneg.pdf
    • https://cdn.shopify.com/s/files/1/0439/8402/7806/files/rozokazupugoviliwutipivu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5952/8355/files/roper_washing_machine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9030/files/how_to_use_neat_scanner_without_software.pdf
    • https://cdn.shopify.com/s/files/1/0432/5713/5257/files/43831372653.pdf
    • https://cdn.shopify.com/s/files/1/0436/2836/3939/files/multisensory_teaching_of_basic_language_skills.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/fexiwivalawaze.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/kukofopowefav.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_off00018099.bin
9e9e74dff56c8882fe6862a785e02937ca4bb866f658d49435d2954b5b5108ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18099 5208 bytes
font_01_sfnt_off00019230.bin
032f8b941ce433a4eaf4ed9d97627376524a78cd31672f8427079154be6cf70d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19230 14556 bytes

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