Malicious PDF — malware analysis report

Static analysis result for SHA-256 264ab57ce7fe5d3f…

MALICIOUS

PDF

43.2 KB Created: 2020-10-27 04:29:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 15c5e3c990f85a0cb981d6764a7262fe SHA-1: 9cc1c27118e2350e951e894c069a29f2b2bb321f SHA-256: 264ab57ce7fe5d3f87b44223cda0ded4f03d8db56e24d608564a9186a9682a13
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 large number of embedded links, many of which point to external resources, including a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that are likely part of a link farm designed to drive traffic to malicious sites.

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://ggtraff.ru/strik?keyword=andrew+jackson+and+indian+removal+worksheet+answers In PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/93049f265a0000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_5f9558f63f258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f87371e5a3af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f87173e1789a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_5f948486517c9.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/norozovijalu/adeptus_mechanicus_codex_deutsch.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/40602229346.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/kureruliti.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/tafupoxad.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/94477113838.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1530/2043/files/stardew_valley_crop_profit_spreadsheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1139/2167/files/67081458955.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8896/0924/files/3765272698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa4af108-7cde-4176-8794-0b6ffa4e3b39/binding_of_isaac_deaths_touch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d7bbe4c-6e8c-4dbc-91a8-6a084286ed8e/70029595516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c23b37-df01-430e-8afb-e396728b11fe/yamaha_rxv573_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c4c2fe4-e044-49e3-9d45-b8a4472d494c/84415792560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0fb4f6-8dbc-4885-a4ee-90b201439c97/57254821701.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/psicologia_aplicada__administrao_de_empresas_bergamini.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/augusto_pinochet_biografia.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_off0000680c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x680C 5460 bytes
SHA-256: 68a746d0478591346711aa58db8fbca38c07f4d64d78efc7e33896fe685e6052
font_01_sfnt_off00007a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A8A 10680 bytes
SHA-256: 065885b687bd64360ba6015da3ea7f81e34751c4ee83d6727b5c1cceb1390762

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