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) First seen: 2020-08-25
MD5: ac2c03d3a30560cad881e7125ddb6876 SHA-1: 5b988267a99ef94587ce951c33be65b1ca91e960 SHA-256: 15837af1a2f60800ea87d85b9f37701a847ebd382b581574c08378c5be3d55a6
194 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are part of an SEO link farm designed to redirect users. The document body text, while obfuscated, suggests a lure related to a 'Toyota yaris hybrid manual 2015', indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and critical heuristics identified it as a redirector link and part of a link farm.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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 In PDF document text
    • http://files.natureinwindsorcastlepark.com/uploads/1/3/2/7/132740482/lemus.pdfIn PDF document text
    • http://files.just-verandas.com/uploads/1/3/1/3/131379045/xobuxisedujus_wekabod.pdfIn PDF document text
    • http://files.appletreecontractors.com/uploads/1/3/1/6/131607712/9709263.pdfIn PDF document text
    • http://files.mayryanmls.com/uploads/1/3/0/7/130739690/2557318d0.pdfIn PDF document text
    • http://files.thetlacademy.shop/uploads/1/3/1/3/131384789/dupive-madelubupazape-dezarekinoza.pdfIn PDF document text
    • http://files.civil-engineering-architecture.com/uploads/1/3/0/7/130775853/wefavo-xelepina-borifiv-nidazifezon.pdfIn PDF document text
    • http://files.ashleynmedia.com/uploads/1/3/1/4/131407281/e4e804.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://kajafalog.files.wordpress.com/2020/07/fivojogonukunifatagux.pdfIn PDF document text
    • https://vezopemu.files.wordpress.com/2020/06/radarozoselod.pdfIn PDF document text
    • https://savoxunopi.files.wordpress.com/2020/07/gixenadilipi.pdfIn PDF document text
    • https://zixutegavew.files.wordpress.com/2020/07/61647549376.pdfIn PDF document text
    • https://lulazuminer.files.wordpress.com/2020/06/fakuwolunominavabijidoje.pdfIn PDF document text
    • https://kemetax.files.wordpress.com/2020/07/wabapudenusijo.pdfIn PDF document text
    • https://jowixen.files.wordpress.com/2020/06/27913969611.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofusibosaduxigagixuvoma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/satofekefekuwozavobijogut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22650439267.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52665001447.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pifafesilepobusofamut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30408896218.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/julanefiwozuxam.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6811 5468 bytes
SHA-256: ca84201315894e869fef3e3e43b9d3bd145c17b86ad93f39468474d2d533a7af
font_01_sfnt_off00007a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7B 9992 bytes
SHA-256: 253aa8f0611b231b0aa0eb3cd93bdb3d64199b258466b997ccf754b186a680ca