Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da096eb260f5153…

MALICIOUS

PDF

42.9 KB Created: 2020-11-03 05:39:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 55f2b50046e29057bbf2512e4de35301 SHA-1: 711aa98a06b5cb93e2eafa64cad54cafe7d8588e SHA-256: 6da096eb260f51537fc4ac0d24b73739ed60676bbb178955a70cd3e27393acbc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector infrastructure, disguised with a keyword suggesting a legitimate resource. It also exhibits characteristics of a link farm, pointing to numerous other PDF files, some of which are hosted on benign platforms but likely serve as part of a larger SEO manipulation scheme. The ML classifier strongly indicates malicious intent.

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://cctraff.ru/123?keyword=free+online+historical+newspapers+iowa In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_5f8d9c1e894f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376629/normal_5f9dca7e081ea.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/1bc17833-58ae-4cf1-932a-2dacb6f377e6/lodanuxizazirebo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4259/5239/files/clicker_hero_codes_pc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0629/4688/files/watch_free_online_the_dark_knight_rises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7853/1255/files/unlock_bootloader_apk_asus.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/fetilurepaxovezevezi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5291/9703/files/hall_of_fame_song_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5250319f-5a2a-4dbd-b05f-f70bcb56c931/40226340865.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6642/4486/files/bozipaka.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/dell_inspiron_17_7000_series_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c2d506a-bc5b-4109-97ce-188454c7acc2/28127121206.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_off0000680d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x680D 5068 bytes
SHA-256: da086e3efa8acbdb352f1a9857e6d51a71f1f6553caedfbede19147758f1fede
font_01_sfnt_off0000795b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x795B 10940 bytes
SHA-256: d303b9b35e7614d54844af0dda4cefdfaf022a665d550114e7ea2f7344b6bc23

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