Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3a1920c2baa38f…

MALICIOUS

PDF

119.5 KB Created: 2020-11-01 23:58:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5358348788f24d2b287393fde23d788b SHA-1: de65235b37470e7badadcd3d3b458908155c518a SHA-256: 4c3a1920c2baa38fa8dae395ae3b5a94bac3dd19fbf2ab95b0a90150e849a52e
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=selena+perez+autopsy+report In PDF document text
    • https://rulomegujenuguv.weebly.com/uploads/1/3/4/3/134329868/24bac59cf5dcdef.pdfIn PDF document text
    • https://tebamebameden.weebly.com/uploads/1/3/3/9/133997375/542002.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/xizefotiwira.pdfIn PDF document text
    • https://dalowosa.weebly.com/uploads/1/3/4/3/134383453/tageje.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/rodigapigeta/all_awards_2019_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66ce951c-30db-43b2-9b72-58925b0552e2/27548732453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef439cc-7493-4bd3-a78b-67bdf10465d1/rusarabalumixetalolos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/971ffc06-28ee-4a2e-845d-482e91df6e96/popibesididebafabagiwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/720ba40f-6da4-4833-b49e-54886221fbc6/44818991870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00759c61-942f-49c4-88a2-ca1fff657e50/level_7_script_executor.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/3_veces_tu_descargar_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/dugigonugukegapuxor.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/vexilar_flx_28_open_water_transducer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/604e27c0-71c0-474a-9d37-b21639be3062/jekuxafolurel.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/hp_pavilion_15-au063_reviews.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_off0001952a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1952A 5068 bytes
SHA-256: 54613c6bbca3f376bf2997643b75bac79ca7804edc434ee66d6ee63976965df5
font_01_sfnt_off0001a67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A67E 13356 bytes
SHA-256: 9eb4ce5333ff9cdf5fa5ad346ac537a98fabdf7f83d5b1e52ddda4c9e2871fe3

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