Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81d52659fbc0625…

MALICIOUS

PDF

45.2 KB Created: 2020-10-03 07:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7bd797ffa449005a303c21fa32622115 SHA-1: e91e8748f6546fda2d326d5efb5c48dfeadae44e SHA-256: e81d52659fbc06254e0bd6c84040346652853e181dfb87a64add1fd30246f7d0
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDFs hosted on disposable domains, indicating a link farm for SEO manipulation or to distribute further malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a potential for malicious redirection. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=english+learner+authorization+csulb In PDF document text
    • http://jinowi.askdocta.com/uploads/1/3/0/9/130969742/5037445.pdfIn PDF document text
    • http://files.alexisgideon.com/uploads/1/3/1/4/131437889/dakezelu.pdfIn PDF document text
    • http://gebod.babbiemuseum.org/uploads/1/3/1/0/131070374/bejebik-puwenakajoso.pdfIn PDF document text
    • http://rosesig.crystalearthmagic.com/uploads/1/3/2/6/132696021/jebixoxufaf.pdfIn PDF document text
    • http://files.coachbobwilliamson.com/uploads/1/3/2/8/132815213/puwilevev_bosuk.pdfIn PDF document text
    • http://zagafeke.almosteleventhebook.com/uploads/1/3/0/8/130813650/1b1a765fa7f4d.pdfIn PDF document text
    • http://sigunub.gbgoats.com/uploads/1/3/1/4/131407089/3b60d.pdfIn PDF document text
    • http://rejif.thewonderousfunderstorm.com/uploads/1/3/0/8/130874153/3382553.pdfIn PDF document text
    • http://files.capecodgypsea.com/uploads/1/3/2/6/132696018/kusedaxona.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://uploads.strikinglycdn.com/files/8a86676b-ad8c-432c-8c1a-af312c3a242f/50984073392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9591cf88-a61e-47a1-ba0e-6cfe34b6e46e/33942667109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57885757-79e2-4072-83ae-e5a7fd1c9539/68687786253.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0057/8723/files/pepixutimekupab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9794/7300/files/23062039856.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_off00006540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6540 5092 bytes
SHA-256: fa4dbbd3d9ede688c9d42e412bff9ce9147543d9ba9b1b0e7562681430d0f0a4
font_01_sfnt_off0000768c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x768C 10184 bytes
SHA-256: be4ecb15c5559c2a1865ca0ba421e4b4c37c29cfc18cb194a2f8c6402caf14a1
font_02_sfnt_off00009952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9952 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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