Malicious PDF — malware analysis report

Static analysis result for SHA-256 d544599b69a3b6b7…

MALICIOUS

PDF

44.7 KB Created: 2020-10-28 23:31:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8a06897a1ff8c883163729ba9a1edfc5 SHA-1: 3c2e2393a4653380049adc50ff97029204c656b2 SHA-256: d544599b69a3b6b7ba6898bec9ffebcd14bcd6b1ffeaff88c7fe42bfeeb915c8
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to known malicious infrastructure, disguised as an educational worksheet. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the embedded URL strongly suggest this is a phishing or scam attempt. The ML classifier also flagged this PDF with high confidence.

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=pressure+equation+worksheet In 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/1/0432/8806/8254/files/clases_de_conjuntos_matematicos_y_ejemplos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/1791/6575/files/el_populismo_en_argentina.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/neonatal_jaundice_causes.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/urbanismo_ecologico_mohsen_mostafavi.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/morfologi_bivalvia.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/riteworab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c92771cc-b85d-477e-8cf9-2acb4ad037bd/23495033954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c549ae7-2dd5-4237-bb95-1b49d3e27b83/jivuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b19394a-cc9e-4f73-becf-71612dc86e82/tuxojusivivupaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba435883-98b9-422a-ab7a-32baa5670887/18616095907.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/14348259512.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/aquacal_heat_pump.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0408/2852/files/cuddy_cabin_boats.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/powevofonanaxatefa.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/13107950756.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/35144053001.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/lapolabokitofagelixepeb.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/mepidobowunizoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8208576d-d78a-4630-97bd-5a029c75ed03/21574063824.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/business_communication_full_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/73258544316.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/24942943449.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/regrouper_fichier_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/xunarigufugaxokad.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/blueprints_neurology_free_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_off00006f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4B 5024 bytes
SHA-256: ebe631303cb84b60d774de70d38e3f05da31494a1387eece944b068f2b078212
font_01_sfnt_off00008071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8071 10768 bytes
SHA-256: cb75fa2fe3069a4db3ed0226592f62a8b23d421020d5f80574b1e4730955098a

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