Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fe457e17b072bd…

MALICIOUS

PDF

40.7 KB Created: 2020-10-28 11:10:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39b96580211cc803f389bfa58aa5cc9a SHA-1: 773b5827a1065352d023e80662d38ffe990c4d14 SHA-256: 89fe457e17b072bd3c1ca17e918c9ad7240ba10b9fce37e4e8aada2b70b9b6c1
154 Risk Score

Malware Insights

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

This PDF contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One of the primary links directs to a known malicious redirector. The document body contains obfuscated text and URLs, suggesting an attempt to disguise malicious content. The presence of numerous external links and a malicious redirector indicates a likely attempt to lead users to harmful content, potentially for phishing or malware distribution.

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://ttraff.ru/123?keyword=ispi+bay+area
    • https://cdn-cms.f-static.net/uploads/4374522/normal_5f98b039d787a.pdf
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5f8aaab09545c.pdf
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f87fb2e24925.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/48e239de-a250-4556-b0ec-3530d5b14312/sosozaginibolujagine.pdf
    • https://uploads.strikinglycdn.com/files/b010bf35-805c-4fbd-ad8b-27f5ef20e379/64386060651.pdf
    • https://uploads.strikinglycdn.com/files/be2f79b5-3c02-4045-973b-0287eb10a3f3/11215167281.pdf
    • https://cdn.shopify.com/s/files/1/0486/1696/4264/files/25971942060.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5396/files/json_response_example_in_android.pdf
    • https://cdn.shopify.com/s/files/1/0498/0601/6674/files/wipunutenozu.pdf
    • https://cdn.shopify.com/s/files/1/0504/0232/8764/files/71903661174.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1447/files/bonenitivutagixabomona.pdf
    • https://s3.amazonaws.com/wonoti/communication_skills_activities_for_high_school_students.pdf
    • https://s3.amazonaws.com/fosagobomap/tax_audit_report_clauses.pdf
    • https://s3.amazonaws.com/zirojopemup/joviwerumip.pdf
    • https://s3.amazonaws.com/salosibejodod/oxford_discover_1_student_book_download.pdf
    • https://s3.amazonaws.com/xanebavifamopez/lusotu.pdf
    • https://cdn.shopify.com/s/files/1/0498/0041/3346/files/measure_what_matters_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0479/6153/8727/files/60935862262.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7473/files/97811514348.pdf
    • https://cdn.shopify.com/s/files/1/0488/4080/2469/files/identidades_trigonometricas_formulario_calculo_integral.pdf
    • https://cdn.shopify.com/s/files/1/0428/2623/6071/files/fujadunumulamanedisen.pdf
    • https://uploads.strikinglycdn.com/files/87e1d8fe-b6b1-4143-87dd-f2c69ae3d821/dawudofonaxetidosine.pdf
    • https://uploads.strikinglycdn.com/files/82c0e2ac-8319-4e0e-8a35-140db5e72842/kaththi_movie_tamilrockers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006136.bin
087ba33b6b7ba7d3db48fdf82a70d6b85345d32de93399602554951b4f3a9866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6136 4960 bytes
font_01_sfnt_off0000721f.bin
092bbd93d4e2c7bac6d58920933da6a1a2ef5426a30262eba27d7ab6287a62a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x721F 10504 bytes

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