Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba5735f286c0857…

MALICIOUS

PDF

40.5 KB Created: 2020-10-18 21:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 40c29cbd0e506fc6eeda3ed08e9e8b43 SHA-1: 4de72642d915ccb9780c08b4e2ee21370742a79f SHA-256: eba5735f286c0857ecf2f1eb3274590ca59236920cb2a8b48e25728c6c67a1b3
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.cc/123?keyword=kinds+of+sentences+worksheet+3rd+grade+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5f871f2f1b1ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369660/normal_5f88eef9d9794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f876652a742e.pdfIn PDF document text
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/4287755.pdfIn PDF document text
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/japakakezixebipo.pdfIn PDF document text
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/1563849.pdfIn PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/40513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_5f893568c87ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375195/normal_5f8c5393ce2dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379982/normal_5f8c6df8207fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5f8bb4723fe48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f87253a997c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca8928ec-956f-4184-867e-cd43605ab5c7/63029930723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49a083f4-de45-4c3e-a219-a6c543264ec2/tujonodevogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5617f62c-0909-4a8a-a69d-1d9221fc82f6/29198365929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59460625-c2fa-4b19-a682-c132aff15eb2/86804713018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dcceedb-311e-4abd-9bca-e71bfb63b10c/63211983679.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8256/6811/files/download_kaspersky_mobile_antivirus_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/0245/2935/files/notes_app_ios_to_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7127/7718/files/mapezamifiwadapuraga.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCD 5676 bytes
SHA-256: 9f75efa91bd0e9911f246c83b8b72e3da16f906e38fe0ae74b5ef3657869adc5
font_01_sfnt_off00007329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7329 10308 bytes
SHA-256: 90e8c97d093905f3cbdbc85d3d17340e26c2e45eb5fc9d6302fd0a4a6db43cde

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