Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2fef593e0320f8…

MALICIOUS

PDF

49.2 KB Created: 2020-11-04 23:27:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 9c0e94082948105b237eaab892e80a98 SHA-1: 5127dcd298cbc34470cb5bea82719cf61930227e SHA-256: 3c2fef593e0320f8521248af64bc9f66ce7065e16ce5f3f8f2f320e421c0c9aa
134 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, identified by multiple heuristics as a redirector for phishing or malware distribution. The document body, though heavily obfuscated, contains the target URL, suggesting an attempt to trick users into downloading a malicious application or visiting a compromised site. No scripts were extracted, but the presence of malicious links is sufficient evidence 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://cctraff.ru/strik?keyword=fingerprint+lockscreen+free+app In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412599/normal_5f9c930fb2ffa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375507/normal_5f937fc3c72e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5f8fc19ed0395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_5f917b1bd816a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/memul/bojevokobagesugifadawil.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/works_cited_page_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/346439aa-380e-4a6e-8cd5-aa167aeb52fb/pokemon_fusion_generation_rom.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/adobe_11_pro_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/butcher_block_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/lanowilovuviwib/rock_candy_xbox_360_controller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9162787a-070a-464b-9939-b43735530119/geography_and_climate_of_virginia_colony.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9496235a-c50b-46ad-85d6-c3ee2bc46ece/sotute.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/cardiac_conduction_system_pathway.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000725f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x725F 4988 bytes
SHA-256: ec7d9f6ed13efb1b153a7cef60c89982defccc8438e7df4201d6ec458f6e6c68
font_01_sfnt_off0000835f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x835F 10912 bytes
SHA-256: de8cabcb8d8345e5210b9d991146d36cc765cd573f3f3544f4f3f34d17ab1d9d
font_02_sfnt_off0000a7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7D8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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