Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3f8a74782b5aea…

MALICIOUS

PDF

43.6 KB Created: 2020-10-27 09:24:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: daa2d8bef1d766ebdf5d6cff9626a415 SHA-1: 9887b310248ef7f61378935b14835dffca1cfce1 SHA-256: 1b3f8a74782b5aea9acb669e1dbd15db62b95d14cfb645bc66b289f87e445db0
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/123?keyword=go+math+grade+1+chapter+7 In PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/cc7cb1b7038864.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/4477745d34684.pdfIn PDF document text
    • https://pujatimosu.weebly.com/uploads/1/3/2/6/132681823/zivatenivesek.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/paxuzoteso-zafege.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/xizaxamuxive.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/kamod.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/1/0502/6372/0119/files/legawuvusisevorujewaweb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1238/0612/files/jajabolebugu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/5452/8181/files/personal_fitness_merit_badge_requirements.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9359/7604/files/ubah_word_ke_online_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4009/3846/files/live_telugu_tv_channels_app_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4962/1406/files/comida_tipica_de_venezuela_para_colorear.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2131/9323/files/murray_sesame_street_clipart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0367c0bf-fe09-44e0-8e70-2c6e3aa595ff/27157337643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d95f3f-ea51-4bfd-9048-813d2a128465/zavumenubasalujavipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a40065bd-1243-4473-9d80-376b18dfa0c4/wozore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8874ea81-2eec-4c5f-803b-5add51f0adc8/lugibakifi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9536/2209/files/30595728832.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1789/5070/files/vutinesixizu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000555e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x555E 5440 bytes
SHA-256: 36201e4c0b2c33ece6d7becc519b4418dc7f19583984ee2ccd3f5fcb27526bdd
font_01_sfnt_off000067c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67C9 10716 bytes
SHA-256: 89237eb8ad9e967f0ed8da494f9f5ec0f800be7992e7b1728c984c821b6197f7
font_02_sfnt_off00008c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C56 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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