Malicious PDF — malware analysis report

Static analysis result for SHA-256 394d3a0126ab0bc9…

MALICIOUS

PDF

46.0 KB Created: 2020-10-26 16:59:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0b05af01d4dddefd6ddab97204531c5a SHA-1: d3f26d3254678353314554192396568d359c3f7a SHA-256: 394d3a0126ab0bc97acd385d714a04ee2b3d96e86663abea69bcb59a91491a53
224 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains a large number of embedded links, many pointing to disposable hosting services, and one specific URL is identified as a malicious redirector. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick users into installing software, a common tactic for malware delivery or credential harvesting. While no scripts were directly extracted, the nature of the links and the lure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gettraff.ru/strik?keyword=troll+free+2019+easy+download In PDF document text
    • https://dojufewuwi.weebly.com/uploads/1/3/4/2/134235401/wumugegimo.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/5ce6e29.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/mezevoxinokimuwamibu.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/92a5619077.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/vokokilij.pdfIn PDF document text
    • https://vaxeratomox.weebly.com/uploads/1/3/4/3/134397216/jidovu.pdfIn PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/xajuxerunuxasi-wexujazawik-xiselibu.pdfIn PDF document text
    • https://jasazifo.weebly.com/uploads/1/3/1/4/131437377/fugevo-tufuwepu.pdfIn PDF document text
    • https://debasomi.weebly.com/uploads/1/3/0/7/130739769/5105209.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/70b0d85b-47b8-4999-ab9b-e8dd44618762/91417290858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a313e3e1-38a4-4dc7-9a8e-86eaeb1106d1/lapozav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94507321-5ce0-4ea6-a8d0-58450ee377c3/kalujadufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4359bdfc-45cd-4d7c-b680-640ec49cd508/98606742153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe79e42-8ec1-4172-8b08-c049436e5a8d/jezozarunovemavusegu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/6_inch_twin_mattress_walmart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/3454/8645/files/16584595337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d09be04-1f79-47fa-8728-4f80b2d28663/dunevogasuxavidaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852047fa-4c2c-4f64-86cb-a260c5607ff3/beduriv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/815a0870-c48a-411c-988e-04351203bf0a/pisepatukisijumegufivab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e65dddee-4fbc-4bca-8a82-ae06b252d74a/kulivimetowudigoteku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feca374b-8dfc-4e10-bd64-bcee06b872fb/58194068668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fb7d053-497b-40c8-b8bb-6815bb1fdbd4/19288511315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b391ea4d-d914-4758-a30c-867dcc094946/45754948865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe11ef85-11d5-4346-9546-468b218f0315/11270883916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/535e6442-9f09-45a4-a33e-bbe085d0af29/75596667938.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_off00007489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7489 5528 bytes
SHA-256: 260aaf704a55c73fcfc74be917ff7705d2c958d4d4fb3a67594337c0523e11ac
font_01_sfnt_off00008776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8776 10340 bytes
SHA-256: 03435d37c712a8a20e752699e18ba96d906f14f5b29f0b4b796b310c6fad8b9c

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