Malicious PDF — malware analysis report

Static analysis result for SHA-256 7895d6d2c542e731…

MALICIOUS

PDF

36.6 KB Created: 2020-08-04 21:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2161adca9b4a8296eb80486c0ab0d03 SHA-1: e929848a75617a7af1a9ada2e4828e7153b7a3f5 SHA-256: 7895d6d2c542e7317f8a1568761a4085985fb9024df6bed0201f39d872585f2e
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a known malicious redirector (ttraff.cc) or are part of a link farm designed to host further malicious content. The document body, though heavily obfuscated, contains URLs that mimic academic papers, suggesting a lure to trick users into visiting malicious sites. The presence of a password archive lure heuristic indicates an attempt to bypass security controls by encrypting a payload.

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.cc/pify?keyword=historicidad+y+temporalidad+de+los+conceptos+sociologicos+pdf
    • http://files.opulenceboutiquewollongong.com/uploads/1/3/1/4/131452846/3850433.pdf
    • http://files.fromrustcg.com/uploads/1/3/1/4/131409264/5317367.pdf
    • http://files.absbrokers.net/uploads/1/3/1/3/131379730/7294963.pdf
    • http://files.hisandherimprovements.com/uploads/1/3/2/6/132681579/0121cc4ee.pdf
    • http://files.adventure360.co.uk/uploads/1/3/1/4/131405977/510417.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0781/8398/files/balaxikiva.pdf
    • https://cdn.shopify.com/s/files/1/0431/0600/9255/files/bedadezezobopugetaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/6381/0975/files/xafutorajipipumamopatibu.pdf
    • https://cdn.shopify.com/s/files/1/0448/4782/5058/files/rabbit_in_your_headlights.pdf
    • https://cdn.shopify.com/s/files/1/0430/6108/4322/files/badirakunotemelar.pdf
    • https://cdn.shopify.com/s/files/1/0437/0612/2393/files/minecraft_pe_server_block_hunt.pdf
    • https://cdn.shopify.com/s/files/1/0433/5910/9279/files/89612084577.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/xaremedepuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/fivofofefinovil.pdf
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/40942528440.pdf
    • https://cdn.shopify.com/s/files/1/0431/1882/1530/files/bartleby_full_text.pdf
    • https://cdn.shopify.com/s/files/1/0428/7211/1260/files/waloworofuzuripukebat.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2944/files/56333601696.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_off00004e26.bin
62f5d055d96702d87e5b331569c6b46b6e19035e75611962784e11ae9c41792e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E26 5536 bytes
font_01_sfnt_off000060f0.bin
024078d25906bfe55c7179b8f87bf73231b8ed8b3b48a50a504ac14a3f2c139b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F0 10312 bytes

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