Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a40b1fe08d9f614…

MALICIOUS

PDF

40.2 KB Created: 2020-10-26 06:11:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 91fcc527510f9f3af1ca653639de0def SHA-1: bbc61d6df9cdcc1042083affb6c1540125a8dc7c SHA-256: 8a40b1fe08d9f614a5c7096877d712750e11bfb1a3ab06bb56bc6fc5d0d6b1e3
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a redirector URL, which is a strong indicator of malicious intent. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and the presence of numerous other PDF links suggests a link farm designed to attract users searching for specific documents. The ML classifier also strongly flagged this PDF as malicious.

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/123?keyword=maths+trigonometry+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384144/normal_5f8f2b432e1c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f87502360f6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5f89648e59ce3.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/jogowezokuvaxu.pdfIn PDF document text
    • https://natulawud.weebly.com/uploads/1/3/4/3/134309077/9212722.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/negibunamowipe_ruxav_rujagamamipaf_bipidijexop.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/73440c3f.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/kufazete/central_intelligence_agency_act_of_1949.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/rational_function_word_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/formulas_and_functions_in_ms_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/dazelupovemakowux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5afefb84-144e-43a4-ad0f-de3a22bf84c3/29307126525.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7327/4010/files/jomunerudowatojemoto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6373/6485/files/whatsapp_latest_version_apk_download_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/76121150866.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/pisexarifujos.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/assembler_document_en_ligne.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/historia_de_la_depresion_infantil.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_off0000597e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x597E 5656 bytes
SHA-256: 0e4da9ecb507f897abe194b8daf8ee30b6113c0ce7db9c336f12af6d88079bec
font_01_sfnt_off00006cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB1 11432 bytes
SHA-256: 39b5a4794833096d94090e4e81ef272c926ce29c3ac3089d3fbeadb43119fcf5

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