Malicious PDF — malware analysis report

Static analysis result for SHA-256 770f0fa2aeff6b97…

MALICIOUS

PDF

38.8 KB Created: 2020-10-28 09:04:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8ff6b1f2339bd59cfe137ecf47d59360 SHA-1: b87264b9650733dafb1a6c6bf3d22305292c5bcf SHA-256: 770f0fa2aeff6b97cb28917f28e2dc0e6074b6944ffe90e7f829c4e0bfadf3e0
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting and are likely part of an SEO poisoning campaign. One of the primary links redirects to a known malicious URL, `https://cctraff.ru/strik?keyword=digestive+system+flow+chart+worksheet`, indicating a traffic redirection attempt. The document body, though heavily obfuscated, contains text related to a 'digestive system flow chart worksheet' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. No scripts were extracted, but the presence of numerous links and the ML classifier's high confidence score support the malicious verdict.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=digestive+system+flow+chart+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388063/normal_5f97ee1e55412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_5f8aa61ebe29c.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/ac924195c51f9.pdfIn PDF document text
    • https://sedifuwenute.weebly.com/uploads/1/3/4/4/134464273/2469038.pdfIn PDF document text
    • https://xumusiroti.weebly.com/uploads/1/3/4/3/134321309/zabetasivud.pdfIn PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/c8e68c.pdfIn PDF document text
    • https://gadigode.weebly.com/uploads/1/3/2/6/132680949/c74167a43e1c.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/2021229.pdfIn PDF document text
    • https://kolivobaka.weebly.com/uploads/1/3/4/5/134500933/2005242d5.pdfIn PDF document text
    • https://bufazori.weebly.com/uploads/1/3/4/3/134377245/1553682.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/64882e5.pdfIn PDF document text
    • https://mabamakozipapap.weebly.com/uploads/1/3/4/3/134315796/5405520.pdfIn PDF document text
    • https://xuduburuk.weebly.com/uploads/1/3/4/3/134323667/4154109.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/ruwitawogo_rusajexedav_lusepapa_takibikezuro.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/zuwixidit.pdfIn PDF document text
    • https://jibudodenip.weebly.com/uploads/1/3/4/3/134364722/vokukojarim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/zujidolonidetafa.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/26653782673.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/general_chemistry_notes_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/veduweperifamo.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/56101188968.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5173/5448/files/gomamafoni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2992/4520/files/gidude.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7995/8168/files/geometry_parallelogram_properties_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9095/1848/files/whispers_of_immortality_book.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_off0000599b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x599B 5612 bytes
SHA-256: e7a4017670bfdff958ea0e4d9ce3c497ba03adc5ae607b92f7affc5c2d897f35
font_01_sfnt_off00006cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAD 9648 bytes
SHA-256: d28c81cb2116484567c25202addf90a28d80d94a240be074dea9e1fe7de874ed

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