Malicious PDF — malware analysis report

Static analysis result for SHA-256 1909a3f35d20799f…

MALICIOUS

PDF

41.4 KB Created: 2020-10-28 22:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: be7af6b5fe5fcaac572bbb2959528ea1 SHA-1: 8380f91c3071caef22e9565f8ccd9d5c208997e0 SHA-256: 1909a3f35d20799ffb1a7fa24b2951b37a588d530815bddb2b2bb959fedbbb29
142 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download button, aiming to lure users to a malicious site. The ML classifier strongly indicates maliciousness, and the embedded URL is known to lead to harmful infrastructure. No scripts were extracted, but the overall pattern suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=character+sheet+3.5+druid In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370097/normal_5f8a8fb749b32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404983/normal_5f94cdb44c957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376354/normal_5f8a7b457ba3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f8c738a72a4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408187/normal_5f94a0aac8614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5f87eae6d83d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370762/normal_5f926812734a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381529/normal_5f90d58220cf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_5f94eed9eb088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f8b9d88243d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5f8893aabd607.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/memul/12416322007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/060b743b-e4ef-4a58-8e47-c2a785241264/gorizew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7b44ce-2a25-4bd3-899f-eb6c57087884/xixunifexutagekuvaviwip.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/99527790168.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/morph_and_allomorph.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/dynamic_meteorology.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/computer_objective_book_in_hindi_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca717d6-60b5-4350-891b-edb42038e357/the_feud_osrs_quest_guide.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_off000062a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A4 5220 bytes
SHA-256: e49500d04250fb55f1dde6ffe9abec9489b604fc71c33384f19652d5b6c71863
font_01_sfnt_off0000745a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x745A 10672 bytes
SHA-256: 2d8ab901248a7d2e7c4cf113f774a407c28a1d49069a82f26e52291454e056f6

Open this report in the interactive analyzer, or submit your own file for analysis.