Malicious PDF — malware analysis report

Static analysis result for SHA-256 b791639a4ea4580b…

MALICIOUS

PDF

36.9 KB Created: 2020-10-05 12:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 32aea0d82ee90a15d4263dfe9385a89f SHA-1: 54cb78d2e49eccbde55fcf911502d9a8a048a277 SHA-256: b791639a4ea4580b1b2d00a1c792b3d83c354d3d6cf0b92e247ed9b04554ef09
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://cctraff.ru/strik?keyword=muscle+contraction+worksheet+answers, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify URLs, suggesting a link farm or redirection scheme. 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://cctraff.ru/strik?keyword=muscle+contraction+worksheet+answers In PDF document text
    • http://mijep.dowdystaxidermy.com/uploads/1/3/1/4/131406837/wesebujofol.pdfIn PDF document text
    • http://files.temporarycommons.com/uploads/1/3/0/9/130969242/e2049cc.pdfIn PDF document text
    • http://libogema.capeagents.com/uploads/1/3/2/6/132681490/vazupebatune.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/1/0435/4097/1674/files/daffynition_decoder_answer_key_d-36.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/todozegeviwiluzoniwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3119/5559/files/cardone_select_power_steering_pump_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0257/9112/files/29172372280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c0262ed-dd5e-4b55-a82f-2cb317a14afc/vanogidamudij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bbeed85-d19c-48d7-96f2-95652af87dc5/defapatubal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/451a5713-0c74-42dc-81d8-a566ad410bcb/81587200610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8bd75b1-de93-4999-9b2a-b577ff870c6f/barixawelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3814d2ec-199d-486a-ab9f-48f9c4a5cb9f/pubosapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3417/1800/files/kixofigetowalanoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1365/4696/files/silicone_popcorn_popper_recipe.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_off00005377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5377 5048 bytes
SHA-256: fb1826bfaa62b437ea9b2a67612bbdb5769f06ec8e08abb3c751854786ebec4b
font_01_sfnt_off000064b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B8 10052 bytes
SHA-256: a116711d8bed550338c8cbf107f97bf0180802ff3128f52a2a3f85b4316f3ba7

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