Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a71660151b6caa8…

MALICIOUS

PDF

43.1 KB Created: 2020-11-04 04:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ffdcfc7f8932ed87a9f26d79ab5914d3 SHA-1: 37d79ef237f4941b734b09a8fbac52f071a954c4 SHA-256: 3a71660151b6caa879c571683832613fd909630f1fedbaa87c69c908b7794095
134 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified by heuristics PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_UTM_REDIRECTOR_LINK, which points to 'https://ggtraff.ru/strik?keyword=driver+license+division+farmington+utah'. This URL is likely used to lead users to a phishing or malware distribution site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious URL is a high-confidence indicator of 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ggtraff.ru/strik?keyword=driver+license+division+farmington+utah In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_5f9ad972e5112.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/lixuduwonifa/14927359912.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/units_of_k_rate_constant.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/piano_sheet_music_with_letters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72959afc-8229-4fc1-81b7-b75a9a84b84c/83277207158.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/79398078456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/477a6148-c5a6-4d21-bd4c-cccda33a3f98/neruwatulazov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1f23b9c-5335-4cf0-a7b7-9aa64e67c219/63984257705.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/horse_boarding_nd.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/antigen_antibody_precipitation_reaction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4431aff5-ad2e-44f4-b81e-49dbe966d281/50483247095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5288959b-1f5f-4165-a169-8c304faaa3e9/75159516317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a42926c5-461c-48d5-8247-224ddef1d441/wasanuboxapiz.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_off00006960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6960 5492 bytes
SHA-256: 2923e1a35bb6a17cb64efd30592f72ffc374946f5389a1358c150108a2d7390f
font_01_sfnt_off00007bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF3 10356 bytes
SHA-256: 06ed72dd5b7a17e9d1da9e2418c271eab72701c4f8f7f83612fad800e1aa75e3