Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d5154af8c7b78e…

MALICIOUS

PDF

43.6 KB Created: 2020-11-05 08:32:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7758a313e0a030f771fde403eda22e6e SHA-1: 9cce7751ba73131296712c4a4befb72c012b3ad2 SHA-256: 65d5154af8c7b78e8ff2769f123900a4624830473abaae32a1e34b5b778ce3b1
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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, routes users through malicious redirector infrastructure and presents a deceptive download button. 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.
  • 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=showbox+5.10+apk+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417534/normal_5fa34a9eb245d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450141/normal_5fa3158a5ba16.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/dezidokezapovujiluwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403266/normal_5f9ad78ee6800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5f90a8a167902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408866/normal_5f94a7c7e4845.pdfIn PDF document text
    • https://xuvaguwofivopi.weebly.com/uploads/1/3/4/4/134463587/fejezududifu_foxanogiwan_rugurukikubak.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/tamobalasu/39427081955.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/nursing_diagnosis_manual_citation_fifth_edition_apa.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/gifiduxuvo.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/simidaserofeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c19294bd-fed2-484e-adc8-0da91198ff9f/10945993311.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/mott__bow_classic_v-neck.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/google_mail_retrieve_archived_emails.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_off00006901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6901 5588 bytes
SHA-256: 32d09920bb4fdc4513f19137eec4454395ed858a7b881f7d495ece053e30388c
font_01_sfnt_off00007c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C20 11108 bytes
SHA-256: 8c22f4778e1db26ffc2c44497166bd9948f4d688be10b1bc665a12d4f39e096f

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