Malicious PDF — malware analysis report

Static analysis result for SHA-256 6431070be28fc9d0…

MALICIOUS

PDF

47.4 KB Created: 2020-10-27 16:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 75f53bdf9f0cae7bb72ba40ef380b523 SHA-1: 8e09d0ec4daa0eef696275e7fdd288eb7f8676bb SHA-256: 6431070be28fc9d0450e07f4b0b22bb41b58570fffa5278e203235c42d148fa8
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 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/123?keyword=halo+assault+rifle+real In PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/maputigog-pedavelewirak-gugakomadaxu.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/vibule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_5f9290011bec8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408599/normal_5f941a1e5e7f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f881ee126f43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5f91d45cbac4d.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/946f2b16-fe12-4d74-bd87-3bae7ab16e1e/fovipovuvifus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82f9a216-5252-4dbe-8a82-c55b6c1ae6d2/mumonum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a92aac8-a4c0-4843-bdb0-10313791bf4a/mezidakanonoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f329e6d-1093-49bb-86cf-d2e95425696d/zuwirinapomufaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cafe6d4d-9b59-4f9b-84a1-b0c3c6539285/53973756152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41bff929-1f39-4d79-8da0-a9851e04c712/girl_scout_cadette_badge_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ab8d585-18d0-4cd2-a6a7-f62e9e232371/39509736750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90360740-691f-4848-aa72-77b79df7f892/toduxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c63df330-bd93-448e-b728-599e5a9db1da/9096777968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64d8b903-27ac-437d-8ee8-d438f0a94603/zogolemenodidojugeniju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bef37ab-4115-4d39-a085-afba112bbc9a/lalapuzamiputopoboti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a0be0d5-8f89-4c7d-a3fb-e3d85505ce4b/sajumopov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff9c0c89-8833-47e5-9e8b-e624b298d416/56677228547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b7615a0-0ba4-45f7-ab16-961512ed01fe/50575532693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87bd5039-cdaa-4635-838a-d73ca1b93533/79364105512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d93a41-2313-45ed-90ab-3affc10b3187/gelamopajanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4837f3b4-9cd9-478f-bf76-d9c2b439a69d/89375347842.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_off00007b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4D 4720 bytes
SHA-256: d039b3e415d3bd13de0bdbe630fa5cd675ce40d9117a9e3c27b459bdc7d51a0c
font_01_sfnt_off00008b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B62 10984 bytes
SHA-256: 92cda8286aa52e2587204a22d1f53db50b45c90b27a3c4514694df955d21a8da

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