Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb35d79d0a4118f…

MALICIOUS

PDF

46.1 KB Created: 2020-10-28 04:00:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e7fab2316bd0a35bc2aa4ddc5065badf SHA-1: 87d16467995e12e2c9db6efb07e72f73b70756eb SHA-256: 8bb35d79d0a4118fdd6fa1a495f84d590b1e129a96c53c410445b8734765248a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm designed to attract traffic. One of the primary links directs to a known malicious redirector infrastructure, indicating a malicious intent to lead users to harmful content. The ML classifier also strongly flagged 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.
  • 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?keyword=regular+show+pops+rap+battle In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_5f906983aaad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380530/normal_5f8fc2459c354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5f87b11f681c9.pdfIn PDF document text
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/2864639.pdfIn PDF document text
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/4630219.pdfIn PDF document text
    • https://vuvofazomegudej.weebly.com/uploads/1/3/4/3/134329778/55015f781a512.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/a302deb.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/tesapibebujep/cardiology_abbreviations.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/after_livro_4_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/hygienic_design_of_food_processing_equipment.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/gimipemegatemanugomulob.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/kidutuwuretibibazukogati.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/89582053228.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/felilumudesoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/ipcc_income_tax_amendments_for_may_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/65329345774.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/gatonizifugiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/distress_tolerance_skills_dbt.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/96322533949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07751b6c-535e-456f-9cae-6bcc5d6f30bf/13456322249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c99a85-4329-4b7f-91d1-3091a5946077/wanoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bdab6ba-13c8-40c4-808e-94528dd9e676/vibraciones_mecanicas_rao_5ta_edicion.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_off0000665f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x665F 4096 bytes
SHA-256: 4b4ea3d853fbc58a8dd92942725edcbdb39e550060dcb2aed940564e048fd211
font_01_sfnt_off000074bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74BC 5320 bytes
SHA-256: 1d63a8672dd9ce852c4be69e6750f4463993180bc235711462fd9920984df4cc
font_02_sfnt_off000086e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86E3 10552 bytes
SHA-256: 09fc5739035c9f067d912083030dface6e85e30858db47f8ec7251f495dfa190

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