Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03c31bf328af219…

MALICIOUS

PDF

97.4 KB Created: 2020-10-19 12:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: be8b61fdedef60a12a0c5508c4c35420 SHA-1: 33f3415732232d85387163bd105ec24e73e8b9e0 SHA-256: c03c31bf328af219500e20ffa4b0e88091c5357171224134fbb3a6a0db1f9799
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector and a link farm. One of the primary links, 'https://ggtraff.ru/123?keyword=cours+de+droit+constitutionnel+semestre+2+pdf', is flagged as malicious. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise malicious activity as legitimate content. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/123?keyword=cours+de+droit+constitutionnel+semestre+2+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373504/normal_5f89ed5ee3fc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f874fcf0b069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378165/normal_5f8b0722a65b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_5f8bd8c234eeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f8a42e254585.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5f8bb0afbc9d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372360/normal_5f8961a37ec9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f8b165cdee0d.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/aa94aa7f99c.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/9ca2380.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/free_download_offline_war_games_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3839/8869/files/electoral_realignment_ap_gov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9268/0611/files/big_bang_theory_quotes_penny.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2678/6715/files/1.1_practice_a_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c45e5aa-6696-4b44-8247-100f4bc40b03/ronapaluz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaca779c-eb5f-43c1-9f89-43644365b315/94999846734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad8c53f1-9675-45fa-934f-0db5e416caff/47753236870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b2382da-887b-4a68-8998-02250ea73b8b/vevanajasuwup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1e6416f-d47c-474d-9f16-e16f1397a031/mobireno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbfc7882-c1f4-43a5-ba51-752676c9951a/xovasesesabijalutonupefi.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_off000135d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D7 5128 bytes
SHA-256: de62d1a2180db3a679d273ec97dcca89741d436a2c09577ba69d67aaeb531200
font_01_sfnt_off00014736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14736 15784 bytes
SHA-256: fc69c7d482aa676ccc99760ecd9fa6a5e1bef7cb9dab10eaf34c8e4a332de88d

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