Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd5b5d9c581dcb1…

MALICIOUS

PDF

46.7 KB Created: 2020-10-27 10:15:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bd5c056b4b4a0871d4dda83e67f89e4b SHA-1: 90833a3ca6e9f7bd44e958f990e5c8ee67bdeef4 SHA-256: 6fd5b5d9c581dcb1f593a26b946913fe7f1c345ccaa5b668914824bb02f35822
184 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 links, many pointing to disposable hosting, and one critical heuristic indicates it's a malicious redirector. The document body text and embedded URLs suggest a lure to recover deleted files, which is a common phishing tactic. The ML classifier strongly flagged this PDF as malicious.

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.
  • 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.
  • 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.club/123?keyword=recover+deleted+files+android+apk+without+root In PDF document text
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/bibesekukemugedovofa.pdfIn PDF document text
    • https://disadaniti.weebly.com/uploads/1/3/4/4/134463451/4440075.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/taneze_luxezasexozuva_nezin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_5f903b0cde9ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405946/normal_5f96c552db08e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376856/normal_5f90c6ca3743b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_5f89aaae61484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384655/normal_5f9073db57bda.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/6431815.pdfIn PDF document text
    • https://reredutubonuki.weebly.com/uploads/1/3/0/7/130775370/fometaja.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/xeroguru/business_buying_process.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/58984228951.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/89382488616.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/6910526563.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/talley_clinical_examination_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6734/1974/files/neruberunax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6342/7751/files/roadtrek_zion_srt_owners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8521/5940/files/rectangular_coordinate_system_printable_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/6998/9570/files/9.2_parabolas_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2797/5322/files/slumdog_millionaire_full_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2727d0f7-a786-458a-b566-ee5cadcdeca1/army_platoon_sergeant_initial_counseling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e10bf7ee-f292-4250-acf7-fb30d1253f1d/tubajowepazumokumelabip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9026dd4-b240-4356-8b92-5e838293e474/46659372798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd9fd388-2e8d-49b3-a1dd-7148a0ff9c49/59331578931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4adb7e9-507b-4d87-94a6-e000a8c369a9/87675417914.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_off00007593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7593 5468 bytes
SHA-256: 45790ea7d35ae4a1ead178ff903cc89b1d2f8f1a0c46a077dcf76da7dfca1946
font_01_sfnt_off00008841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8841 10644 bytes
SHA-256: 3e3c880bb9687c74a1db88275b79fb817358008a8c412c08a6f6d9c2c16ffae3

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