Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fcfb6b208d93eab…

MALICIOUS

PDF

45.0 KB Created: 2020-07-15 09:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e87ed9aae1fc34165f5ad35ca290f955 SHA-1: 54730545ff41224167efa580ace6f6ca21edeca8 SHA-256: 6fcfb6b208d93eabb1023242b4641e11fd4a7d68f5d6db9f4a3a87c32b16536a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the document as a potential SEO link farm. The ML classifier also strongly indicated maliciousness. These factors suggest the document is designed to lead users to malicious sites, likely for further exploitation or phishing.

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.com/wb?keyword=cryptography%20with%20python%20tutorial%20pdf
    • http://files.hometohonningsvog.com/uploads/1/3/1/4/131453076/4721670.pdf
    • http://files.nadi-haas.de/uploads/1/3/1/4/131406433/c8d82aec4f.pdf
    • http://files.holcombgc.com/uploads/1/3/0/8/130813557/bodopewedexigekopose.pdf
    • http://files.waveloopart.com/uploads/1/3/2/7/132740343/883d0.pdf
    • http://files.lindsaysilva.com/uploads/1/3/1/4/131436956/6804795c77.pdf
    • http://files.missdavisluellalions.com/uploads/1/3/1/6/131636990/2077ff.pdf
    • http://files.sillassenhalf.com/uploads/1/3/0/9/130969555/bevijidu.pdf
    • http://files.mrryanmuller.com/uploads/1/3/0/7/130739119/f0bf24d472b.pdf
    • http://files.lisassalonspa.com/uploads/1/3/2/3/132302999/3641bf5cc9242.pdf
    • http://files.dewdropsperch.com/uploads/1/3/1/6/131637385/letaz-senukabuwalibin-domok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://limulitobi.files.wordpress.com/2020/07/pisazoguduzipipatagofe.pdf
    • https://gumoguxa.files.wordpress.com/2020/07/74203674348.pdf
    • https://zapekijibu.files.wordpress.com/2020/06/doletexogobixojimezibepi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/65286306075.pdf
    • https://cdn.shopify.com/s/files/1/0432/4599/4146/files/suxadinirazonobib.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/labevibibenuwapodazutolax.pdf
    • https://cdn.shopify.com/s/files/1/0433/0848/2710/files/93397861675.pdf
    • https://cdn.shopify.com/s/files/1/0428/5018/9478/files/62953805237.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9459/files/fixekuzujizowuzonasobu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/bafipef.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_off00007064.bin
8ebab07885e6a644e2bb56aaf7cfe32a97fbbfbee9fb8c8c118516ac1ee45d52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7064 5108 bytes
font_01_sfnt_off000081c8.bin
9b47b24060e779264fa30bdefb2aa4f7acba47089f415f67d40beafbfa1b2010		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C8 10776 bytes

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