Malicious PDF — malware analysis report

Static analysis result for SHA-256 25421ad34e40caf7…

MALICIOUS

PDF

45.8 KB Created: 2020-10-27 12:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c46eb66c999331c275958d11fbbe5faa SHA-1: d72d2caca309d0d97cae3d615c16e3fff787f7bb SHA-256: 25421ad34e40caf77aa0fcb3a63d11bd84d4b7ccb5f421d205a61fd385701a20
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?keyword=des+plaines+public+library+printing'. The document body, though heavily obfuscated, contains this URL and other benign-looking URLs, suggesting a lure to a malicious site. The 'SE_CALLBACK_LURE' heuristic further indicates a phishing or tech-support scam context. The ML classifier strongly flags this PDF as malicious.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=des+plaines+public+library+printing In PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/abdce.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/7208661.pdfIn PDF document text
    • https://xuzofetix.weebly.com/uploads/1/3/4/3/134371052/6535879.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/gavopa.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/5521689.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/5383047.pdfIn PDF document text
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/mosijamimin-mifikod-viwizajavepiru-pevuzaniridix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7281124-0353-4524-803b-abc405269e39/88707651665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d61412a-6602-4325-b819-3463702bd8f8/petilebakoruge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20322810-d52d-43a2-aafa-0d777e16a9be/64025889195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94ebcb29-a4b9-405a-8d60-0e42bec92047/destiny_2_best_pvp_loadout.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/80558041860.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/fernando_pessoa_antologia_potica.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/plant_embryo_development.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/walmart_employment_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/55083937261.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6723/1394/files/keystone_wheels_refinishing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2099/4720/files/wijop.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/textbook_of_advanced_cardiac_life_support.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/2731513589.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_off000071f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71F0 5340 bytes
SHA-256: 28e8e70e18183983f45e7259dfa29c42a1190df5508a1324d803d7128a7abfa4
font_01_sfnt_off0000842e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x842E 11108 bytes
SHA-256: 3f06b6fa37533e88c64fed1a244ef8c5ef322d3bf412fcf673f28acd4d6e775b

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