Malicious PDF — malware analysis report

Static analysis result for SHA-256 15837af1a2f60800…

MALICIOUS

PDF

42.5 KB Created: 2020-07-09 16:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac2c03d3a30560cad881e7125ddb6876 SHA-1: 5b988267a99ef94587ce951c33be65b1ca91e960 SHA-256: 15837af1a2f60800ea87d85b9f37701a847ebd382b581574c08378c5be3d55a6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with heuristics indicating it's a redirector and part of an SEO link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a Toyota Yaris manual and references to the wkhtmltopdf tool, suggesting a lure to disguise the malicious link farm. No scripts were extracted, but the presence of numerous links points to an attempt to drive traffic to potentially malicious sites.

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=toyota%20yaris%20hybrid%20manual%202015
    • http://files.natureinwindsorcastlepark.com/uploads/1/3/2/7/132740482/lemus.pdf
    • http://files.just-verandas.com/uploads/1/3/1/3/131379045/xobuxisedujus_wekabod.pdf
    • http://files.appletreecontractors.com/uploads/1/3/1/6/131607712/9709263.pdf
    • http://files.mayryanmls.com/uploads/1/3/0/7/130739690/2557318d0.pdf
    • http://files.thetlacademy.shop/uploads/1/3/1/3/131384789/dupive-madelubupazape-dezarekinoza.pdf
    • http://files.civil-engineering-architecture.com/uploads/1/3/0/7/130775853/wefavo-xelepina-borifiv-nidazifezon.pdf
    • http://files.ashleynmedia.com/uploads/1/3/1/4/131407281/e4e804.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://kajafalog.files.wordpress.com/2020/07/fivojogonukunifatagux.pdf
    • https://vezopemu.files.wordpress.com/2020/06/radarozoselod.pdf
    • https://savoxunopi.files.wordpress.com/2020/07/gixenadilipi.pdf
    • https://zixutegavew.files.wordpress.com/2020/07/61647549376.pdf
    • https://lulazuminer.files.wordpress.com/2020/06/fakuwolunominavabijidoje.pdf
    • https://kemetax.files.wordpress.com/2020/07/wabapudenusijo.pdf
    • https://jowixen.files.wordpress.com/2020/06/27913969611.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofusibosaduxigagixuvoma.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/satofekefekuwozavobijogut.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22650439267.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52665001447.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pifafesilepobusofamut.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30408896218.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/julanefiwozuxam.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_off00006811.bin
ca84201315894e869fef3e3e43b9d3bd145c17b86ad93f39468474d2d533a7af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6811 5468 bytes
font_01_sfnt_off00007a7b.bin
253aa8f0611b231b0aa0eb3cd93bdb3d64199b258466b997ccf754b186a680ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7B 9992 bytes

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