Malicious PDF — malware analysis report

Static analysis result for SHA-256 554f24916d4bc12a…

MALICIOUS

PDF

57.7 KB Created: 2020-10-19 04:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 13f0bf4dfd0db4004caeb25f3932f1b7 SHA-1: eb752f0a4fe35546cca16177649ee3e440384fa3 SHA-256: 554f24916d4bc12af014595207d1b73121d6534f5b851e4281fd27a362c5422e
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or known redirectors, indicating a link farm designed to drive traffic. One prominent link, disguised with a search keyword, leads to a malicious redirector. 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.me/123?keyword=tensorflow+deep+learning+projects+pdf In PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/297c0.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/821646.pdfIn PDF document text
    • https://kusanogiwaxug.weebly.com/uploads/1/3/0/8/130873987/6089907cad1d787.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/vunuf.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/1640921.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/6893085.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/62f5ff7457a.pdfIn PDF document text
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/sogog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5f875a8eac02f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5f8a4c7e98960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f88476ce6612.pdfIn PDF document text
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/logowuziseb.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/6993717.pdfIn PDF document text
    • https://femevidawivuk.weebly.com/uploads/1/3/1/0/131071063/burowejizariv_lefel.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/rawaginefewowodofi.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/1/0481/5378/8569/files/kifizexesinuxavodisimoli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9198/3013/files/fapisaragugameveda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1871/3760/files/what_is_bigger_5_kb_or_5_mb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/251a9b6a-e872-4d6a-93ea-7823b6fe4ed7/50174923700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e0a97b4-350d-427b-a85f-e08dc115951c/jomolajinujopolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30845f94-031b-468a-8c6b-4a7409f9dd96/70868295567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1860914f-2475-44c1-ae36-ef8c3c1f815a/93459463616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54c18919-7a76-4f2c-aae4-c45407406edb/revakik.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_off00009713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9713 5440 bytes
SHA-256: 3caadd2696117e700847caf34a3844965f7909b67a5ac51521d39e1ad50a81a0
font_01_sfnt_off0000a9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9B5 15080 bytes
SHA-256: 5f3860c059653540160942da3b10c8ae028910662299ed9f3d6a9e925ff27e3e