Malicious PDF — malware analysis report

Static analysis result for SHA-256 6891ceefc805e743…

MALICIOUS

PDF

38.8 KB Created: 2020-10-29 00:34:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fa1a547c9934e412a995b4c92ef0ad9d SHA-1: edfe6bfcaa8ea8a2cab01be9b2a6241df7e49bdf SHA-256: 6891ceefc805e743f383c7539b0b4ba00c0ebf1ca461adadb81ab9d66c49ff24
132 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, one of which is identified as a malicious redirector. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to redirect the user to harmful content. No scripts were extracted, but the link structure suggests a phishing or malware distribution attempt.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=sea+scout+uniform+badge+position In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5f8de8c2574bd.pdfIn PDF document text
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/tefidasixenabi.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/dc69227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_5f95792ea00ac.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/a3d71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_5f9346e1f00e3.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/mokidujo-kixojovi-zuxapaniwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f899c542b384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5f8897a59263c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f8943ac4ab17.pdfIn PDF document text
    • https://pumewigegokofav.weebly.com/uploads/1/3/4/3/134317234/lawareluvi.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/takateg/jidadulebopanetut.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/42632323555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b61664e-436a-47ae-ba17-05e1cb4943eb/rudiputor.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/goalkeeper_training_drills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d513a36-aedd-439e-afee-ccf84bc560a7/rock_ola_jukebox_repair.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/arvind_ghosh_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/738375ee-3a1a-4a36-9336-7901723952d2/tinazokijatixasa.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/37009297994.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_off00005792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5792 5688 bytes
SHA-256: 83802fcc4b575e797b60a06d93d54a67b52d4543b633dd9884fc8af034282f6a
font_01_sfnt_off00006ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD3 10364 bytes
SHA-256: 86cbc997db516ebee162099299e004622cf1b68984c116b46800a6049b757255

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