Malicious PDF — malware analysis report

Static analysis result for SHA-256 77465393c88ad1cb…

MALICIOUS

PDF

42.5 KB Created: 2020-10-31 15:31:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 849ce9fc4c33dafaba0c69355422bd2f SHA-1: da79d5905fc050c17712879d721b8fbeb96cd92d SHA-256: 77465393c88ad1cb249d18dce33bde88ecfd098320e73578bfc233bbdfbb4f91
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a ClickFix paste-and-run lure. 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 5

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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=microsoft+teredo+tunneling+adapter+has+a+driver+problem In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5f8918740e1cd.pdfIn PDF document text
    • https://tijujuvuxerupuz.weebly.com/uploads/1/3/4/2/134236121/9494934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422378/normal_5f9ceefa0d9b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8ecc9457-c28e-4101-a1c5-551809486ba4/gt_100_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e98d6375-3a15-4d05-a91f-eae8fa191a09/79162625266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eab105c-f5c1-489b-9628-bbddc684643b/zafiro_la_ultima_viajera_del_tiempo_repelis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fdce65b-e9aa-4e39-87b3-852c07811dfe/kazoraganokap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f66fd47-ddd4-4acd-a678-130a787ae4e7/lixizek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40bee36f-70af-4501-82c6-58f853a5eedf/kavowinejamurezalidutawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e521502d-1fa4-479e-b0bf-497e52ae2f25/xebuveboj.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/govujelina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24ca013e-18b7-4c75-b05d-c5fe1455db96/interstellar_hindi_dubbed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb1e03b8-89e3-430e-a838-b11d01a31864/woxegopug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478fc042-0b94-4f5e-8bbf-e1b73eb4c530/45434249587.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59EF 5656 bytes
SHA-256: 022ecebb7111503f2c5229448e5da00b67b7ec5afbaef3aab568b5befb5bc7e2
font_01_sfnt_off00006cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFD 9756 bytes
SHA-256: 824b280aafea142c70106b69cbf2cce6c9def29af46c5d184313f3af4b7544a8
font_02_sfnt_off00008e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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