Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ebfe3677fe5ee7b…

MALICIOUS

PDF

37.0 KB Created: 2020-11-02 15:45:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0ae658841632da2f8aedb91607e99984 SHA-1: d226bc17db576d4ab8780458fe214f4d441aed84 SHA-256: 9ebfe3677fe5ee7bf8e1792a940ac49af9194330a85092c02144b2da26aab792
94 Risk Score

Malware Insights

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

The PDF contains a link to known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?keyword=balloon+tower+defense+4+crazy+games`. This heuristic firing, combined with the ML classifier's high confidence, strongly suggests a malicious intent to redirect the user to a harmful site. The document body, though heavily obfuscated, also contains this URL, reinforcing its importance as a primary IOC.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=balloon+tower+defense+4+crazy+games In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389797/normal_5f95360967660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5f87e1d0a2d95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_5f8c7440161b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417992/normal_5fa002765293f.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/takateg/25778336866.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/pexirajoxutuwusixan.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/sulufidu.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/estres_y_ansiedad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1158/6722/files/51_pounds_in_kg.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/i_saw_mommy_kissing_santa_claus_lyrics_and_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/chauvet_gigbar_2_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d38f02c6-5e6d-4c0f-a134-7f5f73430979/68294951266.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1354/4863/files/wadofori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f117cec-0461-4221-9cec-20aad9ad0f5c/textbook_of_family_medicine_free_download.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_off00005238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5238 5720 bytes
SHA-256: 92f697f476b7a110aa4ad140cdcebfc0c238a3ac2299cf97b092c19400c52e74
font_01_sfnt_off000065c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65C8 9748 bytes
SHA-256: bcd96236cee68b9a72bf1710b6b92fbf49ccad1a9017fe82c69307b485eec5c0