Malicious PDF — malware analysis report

Static analysis result for SHA-256 debfce5d30caabdc…

MALICIOUS

PDF

65.4 KB Created: 2020-11-07 01:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 09f36cd7d863c4c1cb32ad28f7e2c601 SHA-1: 3f2664957ec58e39b8f78b594e80a991586e97d5 SHA-256: debfce5d30caabdca52b7143b50281281851328835a7bb4daedbae4e6f97f197
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of an SEO link farm. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to redirect users to potentially harmful content. While no scripts were directly extracted, the PDF structure and link farm heuristic indicate a malicious intent to drive traffic to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/aws?keyword=surface+awaken+hair+growth PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367952/normal_5f881f9ebda3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f990c2ff2295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_5f8e648e00d37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389106/normal_5f9c2822ef587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_5f9a80492c8be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f86ffe134d03.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/03f829c5-6382-48f3-99db-4d8bee1b29ca/gta_4_download_android.pdfIn PDF document text
    • https://pubosepiko.files.wordpress.com/2020/11/xubesusogolugabizodovu.pdfIn PDF document text
    • https://pixetimel.files.wordpress.com/2020/11/91115823019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b3b6f4-5117-4e40-a94b-e2f8036a8b5d/69211276414.pdfIn PDF document text
    • https://nezixorasiz.files.wordpress.com/2020/11/99248431840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74ba1f7b-010f-4761-9e42-b93486625303/91288287443.pdfIn PDF document text
    • https://nuroturexuwi.files.wordpress.com/2020/11/fisica_2_para_bachillerato_tecnologi.pdfIn PDF document text
    • https://rawunimuz.files.wordpress.com/2020/11/nesuradinonitazuwoxiwuto.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_off0000c19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19B 5192 bytes
SHA-256: a3b26b0660f6aad9bcc14d4d0605d7e55f8c47054ed897d8c353eb4bd89ae0a7
font_01_sfnt_off0000d357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD357 10984 bytes
SHA-256: 867ba9b7369bddbd0005a50f7dbae80a6f7151a0c787bd3adc157e0240f12627

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