Malicious PDF — malware analysis report

Static analysis result for SHA-256 541905e9e248f83e…

MALICIOUS

PDF

45.4 KB Created: 2020-10-27 19:29:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fc70fcbb8f184e649ffaaf0ff7b19d3d SHA-1: 71eb17e981ea6bf8884b75f2601e6770086b12f6 SHA-256: 541905e9e248f83e74c80c579e216fa8fa1adb0d863a395695cf1bc8f7366079
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 critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/123?keyword=escritorio+de+windows+10'. The document body, though heavily obfuscated, also contains this URL, suggesting it's a lure. The presence of numerous other PDF links, identified as a 'link farm', further indicates a malicious intent to redirect users to potentially harmful content.

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=escritorio+de+windows+10 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_5f9518d4421a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_5f8b5dadd45fc.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/gitipelut/jubiregokawepolufakop.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/xevofaxupugoborarevol.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/abstract_algebra_structures_and_applications.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/form_u_payment_of_gratuity_act_1972.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4105/4105/files/15166642418.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8304/5293/files/texuremexibabat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8468/3166/files/alice_is_dead_3_walkthrough_all_medals.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4936/9252/files/mrna_and_transcription_worksheet_answers_key_instructional_fair_inc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6575/9675/files/50826439286.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7308/0996/files/dupopipabegaxetu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3128/1312/files/82698722636.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2276/8535/files/biotechnology_of_natural_products.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5300/7516/files/57657400877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a84eddff-68dc-4582-8e67-05880b36ddee/58014017751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a320aba-1246-4b27-9746-bba6ee64ea92/sofoxulevaliro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f1ae9c8-dc7e-4ba3-8caf-3f8f9b6d3e5e/rabupawojixojavuwulidol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa56bb68-1e3b-4021-afb1-b91c65930a25/3049887978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae2d227-f91e-470f-b486-40b344e5e2c0/dipekizetafixikipif.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/83177989474.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/organic_chemistry_college_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/calendario_uem_2019.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_off00007382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7382 4932 bytes
SHA-256: e84933d03b4c486e414d595e59fe64d5f994e874f2184975ed0c0ab23be92317
font_01_sfnt_off00008471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8471 10544 bytes
SHA-256: 5bd414e04b0ba137ccb1541140354fad56edc9961524b8668724b2401cd73e99

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