Malicious PDF — malware analysis report

Static analysis result for SHA-256 a666a921efa46cc3…

MALICIOUS

PDF

52.1 KB Created: 2020-10-25 14:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bfe839d21e82692f515f9c3b08cf9a61 SHA-1: d50cb35d5f39ad3ac66475502a93d1a838b0fb80 SHA-256: a666a921efa46cc383005171ca1ee32ca78631146a6bffeafe56ea7faf7336e9
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://gettraff.ru/strik?keyword=fazail+e+amal+bangla+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370307/normal_5f881c4ea8f1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_5f89619e233ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5f906066c7e0f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/88d15007-da92-47e5-a323-925f4c38f77d/ford_cd_6000_code_generator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6787/3701/files/microbiology_with_diseases_by_taxonomy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/puisi_candra_malik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4643/4976/files/dc_comics_guide_to_writing_comics_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/6852/0131/files/descargar_geometry_dash_meltdown_full_apk_mod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7650/1158/files/extractor_de_leche_manual_como_se_usa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8222/8907/files/wibotunulodi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9838/3545/files/56287635916.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8996/9820/files/8588131289.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2575/9893/files/63967137949.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3071/5288/files/zewivuwaxedozan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e83154e6-5ab7-42ba-8925-f399d80e8e25/87578692877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb7eace3-6034-4d46-9017-b5882c68c7a6/lirama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/131dbde9-5bb0-40c7-a048-f88634318922/11546405707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b131eefc-69aa-4557-9121-167b33c464f3/rakulovalitaposu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f17b4625-5761-4a47-85d8-d5a038b85904/21533570022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5473b91-604e-4231-9bf6-786b3534a5e6/wosifutogezidafef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32330a97-5d61-40c9-bd4a-cfce3812c23f/43350438605.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000656b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x656B 5324 bytes
SHA-256: 1c0b8b16cfceddc451b9cb4b3bd24c9bd3b76372dcdf7d60f026bda65e8b1400
font_01_sfnt_off0000778b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x778B 11412 bytes
SHA-256: bde3125cf5092149367a7129e19d229dfaf27fa69dec4e0edf102bdd8bd78311
font_02_sfnt_off00009b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B7F 10516 bytes
SHA-256: de642b9d6d09ae9165006356c271d161d4512800449fee6dc3b2a2d877210d2d

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