Malicious PDF — malware analysis report

Static analysis result for SHA-256 55432d51d40d6ca2…

MALICIOUS

PDF

73.6 KB Created: 2020-11-02 15:40:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 951e9bfc8aa7d44afa9c134683a9a6ea SHA-1: 1ce708d64b7f2c73088f6b2988e88ef52c360135 SHA-256: 55432d51d40d6ca236483a52f862100ff6d76388101f4d4928cbfd66a4ac5d6e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to games and includes URLs pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious sites. 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/123?keyword=games+for+girls+to+play In PDF document text
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/bitojenufawame.pdfIn PDF document text
    • https://penulikadima.weebly.com/uploads/1/3/1/4/131482887/66cfa.pdfIn PDF document text
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/2434255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393363/normal_5f9c274d006d7.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/41defd1ee3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5f87c7eda4e25.pdfIn PDF document text
    • https://zejibafubetu.weebly.com/uploads/1/3/4/1/134108860/4d2de48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_5f98a8eee421f.pdfIn PDF document text
    • https://kawewadibuporak.weebly.com/uploads/1/3/4/3/134371142/bokekomalaz-serekav-sopejuli-fatotib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/245f4b68-7f01-4239-8264-fafcc6895f73/98201486635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efd28c9c-b182-4ef1-a7b9-43bd729b63fe/misplaced_and_dangling_modifiers_exe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49C 5036 bytes
SHA-256: 9ba7b954b7eae2fb71687af78e79e90e526026c6d25cefb6c32e905567536b87
font_01_sfnt_off0000e5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 11336 bytes
SHA-256: cec62ffed90eba9df0b9bf7c6f9fb41b9e850b1eb28a9918dd0ebea47ffd9e6b
font_02_sfnt_off00010c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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