Malicious PDF — malware analysis report

Static analysis result for SHA-256 b621ce68497bf237…

MALICIOUS

PDF

34.0 KB Created: 2020-10-25 20:35:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 726d2ccd3274cbec985188684d912bee SHA-1: e3323c239d23970083a77ca83e15f1372f742cf1 SHA-256: b621ce68497bf2374916e148d032f277685b6e8144bad4c007619d7bbefa893a
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector and a link farm. The document body, though partially corrupted, contains a URL that matches the heuristic findings, suggesting a lure for users to visit potentially malicious or SEO-spam related websites. No scripts were extracted, but the presence of malicious links points to a phishing or SEO spam campaign.

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.link/123?keyword=dulux+professional+colour+guide In PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/3357820.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/427e8.pdfIn PDF document text
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/131a2807.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/1/0499/3495/8753/files/how_many_letters_are_there_in_the_hawaiian_alphabet_21.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7931/1253/files/constitutional_law_book_by_isagani_cruz.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/asciidoctor-_title_page_layout.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/deep_and_shallow_ecology.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/amortissement_linaire_cours.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/shrek_2_movie_script.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/36155454695.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/33736249404.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/mikorudomesoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/47347069565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51319f18-0f50-4c6d-8f7c-9e79581f4946/barudugaxaganuvapabidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65338143-39f7-42d6-b47a-6ef04ff2ab32/devutisadopojiloximofiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6595e4a3-a7ab-4b32-978d-3a0d0431a6f6/pirofidonasopiwusozemifep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/235d9e4d-c702-478f-bdc2-2b5698b3b78b/83793632733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b61f141f-d918-446c-a85a-ae8ae9ad844e/xufozerasibuxulozizudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf44c292-6d5b-46d7-b6b9-27a0a8bfcfc8/74230724990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc0ecc20-2e70-4ca6-a01c-85fc859536f2/cricket_score_sheet_in_c_program.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_off000048be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48BE 5392 bytes
SHA-256: 98eea73c11ece65d1733921571f4b56274a0d63a4fae2bf0e0553460b8f31957
font_01_sfnt_off00005b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B25 9360 bytes
SHA-256: cc7312478fadaeadd1ca6a24d85e4dd1838ef78230de10472b32e97c78d5762b

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