Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9725d4f75203a6a…

MALICIOUS

PDF

45.4 KB Created: 2020-10-30 09:58:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 843d0f1daa5b4e4ea1246f696e9878b1 SHA-1: 9e7bc47028db6c97967224091f345e3625f2e2e2 SHA-256: e9725d4f75203a6a737d4ae796b1f26d24bdaed3a7d538b71758d4f81430b265
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector services, indicating a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the heuristic firings for malicious redirectors and link farms suggest the primary goal is to drive traffic to potentially harmful sites.

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.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ttraff.link/123?keyword=mind+trap+questions In PDF document text
    • https://xewebetolibas.weebly.com/uploads/1/3/4/3/134372476/bifefufibuxul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_5f95bc72e77f6.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/3794325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5f9bb5154310d.pdfIn PDF document text
    • https://dalowosa.weebly.com/uploads/1/3/4/3/134383453/jakekofukalebowumuv.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/fimeweregu-redidiruga-gukaxusufunida.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/8536469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423188/normal_5f972b0e313e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411220/normal_5f9425c74ea6b.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/mogujoregojiju-simuvazutoxarep-midujuredom.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/bf4458.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://cdn.shopify.com/s/files/1/0482/7915/8945/files/13659721169.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/506_assignment_answer_in_english_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/bsnl_junior_accounts_officer_syllabus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/3936/2719/files/guide_taille_soutien_gorge_hm.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_off0000638a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x638A 4932 bytes
SHA-256: 606225b82ffbb488b22fdba58e4244060cf24bceaf948307a8fe5f1503f6e65d
font_01_sfnt_off00007450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7450 11308 bytes
SHA-256: f23750508970b0c2701e0ffc3df807d234f18f6d8a8caeefa6a1abbe700cab8d
font_02_sfnt_off00009ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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