Malicious PDF — malware analysis report

Static analysis result for SHA-256 632384b189a28c6b…

MALICIOUS

PDF

43.8 KB Created: 2020-11-01 10:02:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d03d5781789e3f1973308508fc7cff9e SHA-1: ba988235764861cdfb7ea5898dc1490359312f66 SHA-256: 632384b189a28c6ba88258efe09ceb87a90665bb80a2c157dd4e7678498ec522
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?keyword=howl+s+moving+castle+piano+notes'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of a malicious URL within the document body suggests an attempt to lure the user to a compromised site, likely for phishing or to download further malicious content.

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/123?keyword=howl+s+moving+castle+piano+notes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_5f87540630a2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_5f93b9452d550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383322/normal_5f8db209c7898.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/jobavo/adverbs_of_manner_exercises_elementary.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/geometry_chapter_11_resource_book_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e9784e-9093-43af-a271-94f7b218d8d4/wifusagotujawekanugubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/193013ff-f189-4edf-abd3-b3c9e6214721/wanemujiponimelese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/448ec1b3-ffb1-4b8a-84b0-a2f5341799eb/10018084395.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5233/4748/files/nudaginalidugosis.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000522a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x522A 5268 bytes
SHA-256: a5d2638929b871e5c8f15cae0826b4fab7c53c891c82e8c4e42cbac57ea1ff2a
font_01_sfnt_off00006425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6425 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00006f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F87 9484 bytes
SHA-256: f3ebd6e788ede352a9ffa31144f76b55d6eb4c112fd6d0680286f257e1576f3c
font_03_sfnt_off0000903b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x903B 4872 bytes
SHA-256: 3351012820b5156f0b0e335afcd89488f2fa60439956712ae90ace17d944d98c

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