Malicious PDF — malware analysis report

Static analysis result for SHA-256 239871e3e7d398ea…

MALICIOUS

PDF

50.4 KB Created: 2020-10-25 07:07:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0b8f2278ea3b4382f2cd35165aeb4457 SHA-1: dd294317385adcd5565b3862f38e4f9fb6499bbd SHA-256: 239871e3e7d398ea4664a0d205aa2bdbce5b731e5a8f526f6069539be7d3da4b
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://ttraff.club/123?keyword=iit+electronics+and+communication+engineering+syllabus+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385612/normal_5f8f8eacb5fdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5f8ed515c8bc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385614/normal_5f94d8afebbae.pdfIn PDF document text
    • https://pobezewimo.weebly.com/uploads/1/3/2/6/132681951/mirugodize.pdfIn PDF document text
    • https://kiseridebajesa.weebly.com/uploads/1/3/1/4/131408791/muxubuva_tunediduvenuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/4272/1951/files/whatsapp_apk_for_blackberry_os_10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0225/5770/files/83649119121.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5865/7430/files/units_of_stress_intensity_factor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7428/4446/files/tubemate_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9629/4051/files/minecraft_building_tips_1.16.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5778/2690/files/cowboy_boogie_dance_challenge.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/caballo_de_troya_5_descargar_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/guvuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/rolidugoverijikatebalexa.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/bridge_to_terabithia_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/bijection_reciproque_d_une_fonction.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/history_of_early_childhood_education_in_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/al_quran_only_bangla_translation_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/carnot_cycle_efficiency_derivation.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/calculus_integration_formulas_in.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_off000083d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83D0 5656 bytes
SHA-256: 29db2ef96610b2606a7fcd99ec6525d3080da27b649b393e27f02746f621b996
font_01_sfnt_off000096fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96FD 10828 bytes
SHA-256: 214b6a4d72dc2a5a272509ecf77576b1478d0cea0cd68d611f012b452ba188bd

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