Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6354ab934919c9…

MALICIOUS

PDF

116.8 KB Created: 2021-01-08 20:51:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 285992765515fe6399caccf856923ff1 SHA-1: 076688abbd137fe07804163cf016f0eb08f36e9e SHA-256: 5c6354ab934919c938eec24589f95ab703663654aea43802ecaffd32dc0fc866
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the presence of numerous links suggests an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/wb?keyword=funny%20words%20that%20begin%20with%20the%20letter%20c In PDF document text
    • https://cdn.sqhk.co/bimepefav/iiIjeAH/pc_games_more_wow_bibel.pdfIn PDF document text
    • https://patobozojewe.weebly.com/uploads/1/3/4/8/134863794/6876484.pdfIn PDF document text
    • https://sekikeke.weebly.com/uploads/1/3/4/7/134739811/zugevani.pdfIn PDF document text
    • https://karujelibofab.weebly.com/uploads/1/3/1/4/131406149/zelivaxagiwino.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/tokafanawa/biophilic_interior_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8c68954-5546-4e06-949f-55b35efae92e/99446293148.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/45365506720.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/samsung_android_mobile_codes_list.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/baixar_editor.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/artist_management_for_the_music_business_download.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/45548591815.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/bayesian_network_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/49934447305.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_off00018f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F42 5488 bytes
SHA-256: a09990544e5677df3837409af824f7b8d2b1f93dc0ceb9b39370e212042ce4d3
font_01_sfnt_off0001a203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A203 11760 bytes
SHA-256: 0ce18fd75bade304e32c6934764362bc2ac6de53eaec66cbc05f91154acca6f5

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