Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fd02ea1d11c362…

MALICIOUS

PDF

41.7 KB Created: 2020-07-10 13:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 720188ce9d32772f86d70af6063c5225 SHA-1: e22b9ced87dd6660fb7f03408c67294450a55f6f SHA-256: 12fd02ea1d11c362f9cf25df43e137b5cc8cb8011d67f15e97c44ae5195bde4c
194 Risk Score

Malware Insights

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

This PDF document employs a lure of a thermostat manual to encourage users to click on numerous embedded links. These links lead to a redirector infrastructure and then to other PDF files, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of redirector links points to a phishing or malware distribution scheme.

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.ru/wb?keyword=manual%20for%20white%20rodgers%20thermostat%201f80-361 In PDF document text
    • http://files.solkitchenfoods.com/uploads/1/3/0/8/130813799/zuzedo_wasejotu.pdfIn PDF document text
    • http://files.chinookriders.ca/uploads/1/3/1/4/131453934/9f5465422db.pdfIn PDF document text
    • http://files.megastone100.com/uploads/1/3/1/3/131398253/kalunezodinive.pdfIn PDF document text
    • http://files.tallsmallproductions.org/uploads/1/3/1/4/131452741/majaxuvifut-vopegasumo.pdfIn PDF document text
    • http://files.mrsbartelsphysics.com/uploads/1/3/1/3/131398517/2810070.pdfIn PDF document text
    • http://files.frankklohr.com/uploads/1/3/1/4/131408062/89ae001fecef.pdfIn PDF document text
    • http://files.minneysyachtsurplus.com/uploads/1/3/1/8/131872285/7373998.pdfIn PDF document text
    • http://files.ripmarkens.com/uploads/1/3/1/4/131409909/7335212.pdfIn PDF document text
    • http://files.brendaniman.com/uploads/1/3/1/3/131379115/xetuzonej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zusuxomo.files.wordpress.com/2020/07/28547632491.pdfIn PDF document text
    • https://zosabepoburi780433350.files.wordpress.com/2020/07/fareveruvavadufasug.pdfIn PDF document text
    • https://xuvabogov.files.wordpress.com/2020/06/92733229768.pdfIn PDF document text
    • https://dupalusojo.files.wordpress.com/2020/06/mosorikukunolinigidamewu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0185/5646/files/lobuzegegamojum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tapowizilefaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuxovozukirofavekejob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zosakasebiribo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kexikebesadunav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/5444270165.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_off00005a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A04 6036 bytes
SHA-256: 22fefd1631ce4d6e9ac233156733db277e05ac177dab2429e9cad368a13d89c9
font_01_sfnt_off00006e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7E 13808 bytes
SHA-256: 807d0bc7a693f46a0f17ea6f7056a726df24c560d48680436e2d473e23ec1e7b