Malicious PDF — malware analysis report

Static analysis result for SHA-256 d512e4b0e0f89b92…

MALICIOUS

PDF

74.0 KB Created: 2020-11-05 11:50:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2b7217d3776b9a6daad007d66983e7fe SHA-1: 2cfd25682780af3123171848b2039957dc6a488f SHA-256: d512e4b0e0f89b92eb1bc30d4784e8b8106ba7097f87646ddc3ae4be4915e9dd
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=townhouses+for+sale+panther+valley+nj In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_5f927104a7617.pdfIn PDF document text
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/746838.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/penubudel.pdfIn PDF document text
    • https://kizozejibudi.weebly.com/uploads/1/3/4/4/134460324/ec4ca72ace.pdfIn PDF document text
    • https://wubigunes.weebly.com/uploads/1/3/4/5/134507070/vedidirapomep.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/toguvaju/rozunel.pdfIn PDF document text
    • https://s3.amazonaws.com/nujosuwemedadi/mxl_iptv_apk_2.3.5.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/calculus_solutions_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fafe363-afbf-4d3f-85a9-2b0c72effa84/30419580703.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/gevevunazoguwonefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/366704a9-6f9e-4259-baf7-bda568dbc9a4/raxizerusuxokep.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/puzisimonuvodi.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/duplicolor_paint_shop_candy_apple_red.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000ed63.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xED63 25776 bytes
SHA-256: b63e36912b689b84afec73b70bb9d8826cdca379985e2e5bc978b1f5f7022797
font_00_sfnt_off0000adfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFA 5268 bytes
SHA-256: e3dbabcb71a8a7f707266990095d0114fde07452f3643a889b3e17e5ffab5430
font_01_sfnt_off0000bffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFA 14432 bytes
SHA-256: 8f4ea2a8aa19c705462a541b74a978fbb207b397609ff70eecd9eafd26a9473c

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