Malicious PDF — malware analysis report

Static analysis result for SHA-256 324193884bb8cab6…

MALICIOUS

PDF

108.9 KB Created: 2020-10-15 00:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 13f1842cbd94aa2fb7dd5d8bb07aff33 SHA-1: 4cb21c582d1709c8e79544bc52e8fa7ffb4d53a1 SHA-256: 324193884bb8cab62b40d53449d544ae21724dd84ed6e3cc6942eee8fb14e28d
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external PDFs, indicating it is part of a link farm designed to manipulate search engine results. One of the primary links directs to a known malicious redirector, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the embedded URLs and link farm structure are strong indicators 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.
  • 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/strik?keyword=introducci%25C3%25B3n+a+la+epistemolog%25C3%25ADa+gen%25C3%25A9tica+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f876d2f39fd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f876abfd2559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5f876a304948f.pdfIn PDF document text
    • https://paduxadoduxim.weebly.com/uploads/1/3/0/7/130775016/tilit-masib-gudokololopi-nerirewuzek.pdfIn PDF document text
    • https://jedarixires.weebly.com/uploads/1/3/0/9/130969076/2766802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f87502fb57ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f86f491a6777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5f876c8c93ae1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5f873728409c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f8732fd0f70a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f876b57d548a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f874b26f0bb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f87087d7dbaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f87110121169.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5045/9032/files/when_i_was_7_years_old_lukas_graham_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6596/6741/files/obama_alien_defense_unblocked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1602/6815/files/homeopathy_books_in_tamil_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/5553/0151/files/cinderella_prince_name_disney.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_off00016890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16890 5744 bytes
SHA-256: c8e6183b211f7aba48f33cd1a84a22232039713cb3f99e8a2964c0387b02e856
font_01_sfnt_off00017b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B6D 12428 bytes
SHA-256: c40a96038fb57589621031498d02b0bc8d67531902a38e41f2ffd3ea0c32b56f

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