Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67f5244f1583071…

MALICIOUS

PDF

66.3 KB Created: 2020-12-08 03:25:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1294132764db02e04a6627d796ff8b8a SHA-1: 7f1bac07f4a97e94ec91b16572bb7e8a8e13dd77 SHA-256: b67f5244f15830718000fae3d7fc311bc4d4280f5f4b657ad0f4837a434ed65c
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or are part of a link farm designed to manipulate search engine results. The primary malicious link identified is `https://cctraff.ru/strik?utm_term=basketball+team+names+and+logos`, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, appears to contain text related to basketball team names, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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?utm_term=basketball+team+names+and+logos In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416796/normal_5f99d2a79c095.pdfIn PDF document text
    • https://nisixokavenofaf.weebly.com/uploads/1/3/4/8/134891603/gupiganaki.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/3cb113af6.pdfIn PDF document text
    • https://mekuluvuxagol.weebly.com/uploads/1/3/4/5/134589608/lofobas.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/93110add-b53b-4e8b-a54e-dc74ca1dcf3c/a_bright_new_boise_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f864ce05-83c1-495b-aab6-471f704fbf9a/progress_report_comments_for_elementary_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d97b3f6b-5d6e-45c9-a3d2-04213eb233a3/movogeleferoda.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56310bf71053ccb2da539/t/5fca0584ec1d586fb3926165/1607075208765/ps4_street_racing_games_2019.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b0585426f52a30e09280/t/5fcc5f0c6f0099009e5a1f30/1607229197061/wirulurirugubuv.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4ce86403f5353fdaeacb4/t/5fc87176094cf7617dc126cb/1606971767437/wibivusimujinilavaw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc373c8df132613bbcde1a1/t/5fcaf2ab6e74d26c6ff5c7b4/1607135915920/business_strategy_game_year_12_decisions.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4ef5cbe9b69395124a64b/t/5fce1bc1978da30c56254a9b/1607343051455/basketball_dribbling_training_videos.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_off0000c75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75B 5304 bytes
SHA-256: 357ddda9fbc6df79f9fda7059d08bf36607ea1482dd5a4c594428914e9965e67
font_01_sfnt_off0000d959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 10384 bytes
SHA-256: 7f6f68413c43bd92b7115802916675d64c7de1c99cdb98285fa624d23db5abe0

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