Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2be36aefa5d85e…

MALICIOUS

PDF

37.3 KB Created: 2020-10-16 12:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5f74737424d9850e87c100411a1cedbe SHA-1: ef7c772709779a85905769c8708483ceb55ef1d4 SHA-256: ad2be36aefa5d85e04bc09968ebb6f224277d21c6919a0fff252cbe35e0992c6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to a malicious URL, disguised as a free preschool worksheet download. The PDF also contains a large number of links to other PDFs hosted on Weebly, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness.

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.me/123?keyword=preschool+worksheets+age+4+free In PDF document text
    • https://tamagokevalagir.weebly.com/uploads/1/3/0/7/130776783/fugowilop.pdfIn PDF document text
    • https://bigogewoxof.weebly.com/uploads/1/3/0/7/130739615/zipivagagariju_gipupikukotif.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/8279107.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/3cfd05c7.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/f876f6a91bb353a.pdfIn PDF document text
    • https://xanodupujariris.weebly.com/uploads/1/3/0/9/130969381/9112494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_5f870138bf6fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5f88320be5e9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5f88d6c11cc67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f879fef2531e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f86fedf353e3.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/1/0433/7047/9772/files/speech_therapy_sentences_with_m.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6428/5592/files/zefirowugodoxemaduvoroke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4359/3109/files/ngk_spark_plug_heat_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/4293/9290/files/control_wizard_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0863/8106/files/advanced_excel_in_marathi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7662/6848/files/juzufosevilutojejedas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/1836/2269/files/everyones_an_author_with_readings.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7302/7749/files/keranulogesofojubimab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e71e2ed8-45c9-44db-959c-7060cec659d8/lelakoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9328b15-2d63-4213-b58c-5f51d2fe8ffe/luzukufupigatudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dfadd4d-ceaf-4165-bd32-d96f8a644586/tujitubabevigakod.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_off000051fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51FE 5388 bytes
SHA-256: 86dc203b56d35a293a2db7fe000323d106552fa1338c171fe57d8846bcfbc1d0
font_01_sfnt_off00006460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6460 10176 bytes
SHA-256: 4293a88264f48e8b4016eaafe57bd2071ef5da72f93b3d79e4702935f98307e3

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