Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce63f4e953da0da…

MALICIOUS

PDF

34.1 KB Created: 2020-10-29 15:23:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fdc2244729f897f125fbd9b551b1d086 SHA-1: 36753971231fea9bc7eb454d34a1f7f8b5a0039f SHA-256: cce63f4e953da0da0aa02e7e931bc5770446c1fde5e2c623003a99df892d1cbe
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?keyword=hoover+steamvac+spinscrub+f5899+manual'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are benign but serve to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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/strik?keyword=hoover+steamvac+spinscrub+f5899+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415951/normal_5f9a2b69a8b83.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/84c6989c-0013-4ee0-acc8-013b2d3c3208/2555407378.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/xepowonabifesejew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b38f472-0933-49a1-862e-af8b1ca90e87/talakekemaruxegemesi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9085/4566/files/garmin_vivofit_3_user_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/2798/6109/files/2_player_football_games_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d5c6800-4f7b-4e87-84b1-f296e8b951f0/como_amarrar_una_corbata_fernanfloo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4885/2885/files/37699203556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91fbdd2f-2aea-4156-9fbf-d24b3407ba54/dadakiluwanasanozexepar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7277/4832/files/nih_payline_percentile.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/meteorology_and_climatology.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_off000044f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44F7 5796 bytes
SHA-256: b8832f7ef849097becca38d1b4e091021c1ab5e96993e668527d93f8a1f96e65
font_01_sfnt_off000058a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58A0 10684 bytes
SHA-256: c591474912f73b405a0de599417da777a50838361ad207ac405fcad1e1ab5365

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