Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afef96f3bccbd1b…

MALICIOUS

PDF

42.2 KB Created: 2020-10-29 07:04:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a8ffbc4f90ce39273a5960c3a61f515b SHA-1: 1fed7b8db2d2a1739a8a8a65bdfefa216a0d98da SHA-256: 4afef96f3bccbd1bca1fb922d4d7e1729e8f98c0fdff9a86dca09784d8fad79d
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One of the primary links directs to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that leads to this malicious redirector, suggesting an attempt to lure the user to a malicious site.

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=how+to+tier+up+shadowforged+armor In PDF document text
    • https://jejoduruledeg.weebly.com/uploads/1/3/4/3/134396934/2501ba.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/0851648.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/filosom-lusiwikafese-jerupuxorukoti-novubolifunuw.pdfIn PDF document text
    • https://fawefugixizim.weebly.com/uploads/1/3/1/3/131383791/622d8d8599e.pdfIn PDF document text
    • https://rixokofumi.weebly.com/uploads/1/3/1/3/131380985/gatitetaxadud_mizowoxidob_nupugu.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/1/0440/9350/5688/files/wonosofusafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d13448-1806-491c-88a6-a289baceb1fd/30795905832.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8911/6349/files/mankey_evolution_chart_levels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a3d64ee-5b7b-44a0-b3ed-947dcb13f071/87211979527.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/6066/3746/files/worksheet_on_preposition_for_kindergarten.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9929/4363/files/level_of_social_media_addiction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d2cd03b-00ab-4486-a237-63f883db1a3f/50469608194.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7758/0973/files/malayalam_cartoon_kathakal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef3bb9cf-d613-4514-819f-3a5faec61281/15804905489.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9114/1801/files/ridurre_mb_file.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0863/8632/files/cpu_z_apk_file_download.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_off00006615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6615 5476 bytes
SHA-256: 2ac7bb575edb28d65a00714bdc925a2a190d67b66ef808632327c9c945656284
font_01_sfnt_off0000789f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x789F 10340 bytes
SHA-256: da0e313bdbc124727b6d3a769eb8ac0bb652049d5892e8d90f7c65f6723faefe

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