Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e61a6aed3162a9…

MALICIOUS

PDF

58.4 KB Created: 2020-11-05 10:31:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 266da1fb79a7fe3abc77a50bb0589826 SHA-1: 21d216b2cf39a43c5e79246fa09cd32088b57c34 SHA-256: 53e61a6aed3162a9714441e9f8d021ae37984b69b5ff8bf1f32c7f61730b5953
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 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 4

  • 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.
  • 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.com/123?keyword=whirlpool+washer+manual+cabrio In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mipeboro/assistive_technology_in_the_classroom.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/92337111966.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9845/4693/files/mafia_3_walkthrough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a8ed8b-d5af-489c-b185-d2bc78498e38/manga_zuki_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/hamilton_musical_full_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/indiana_real_estate_purchase_agreement_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/linkin_park_burn_it_down_video_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/xunufopisamekigag.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/understanding_the_linux_kernel_daniel_p._bovet_marco_cesati.pdfIn PDF document text
    • https://s3.amazonaws.com/bunobu/controlling_idea_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/apa_format_citation_example.pdfIn PDF document text
    • https://s3.amazonaws.com/zokokamu/jigevuxuxoromi.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/kevadipiwosukobuse.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/kundalini_rising.pdfIn PDF document text
    • https://s3.amazonaws.com/naramuro/72363638485.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_off0000a24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA24F 5420 bytes
SHA-256: 5d247cc7dc4aa2f749c2e554dd883a8f627e34442e5c3035a821a7f6a2079503
font_01_sfnt_off0000b49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49F 12076 bytes
SHA-256: 47f0cba7d7c48e348956e9bb2bed6718ce51f95883c01204b7d5d7da3e42fcc7

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