Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ba87448a2a90c0…

MALICIOUS

PDF

62.8 KB Created: 2020-10-18 06:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7f881e91bd11db97db89903795fc9454 SHA-1: 689cd70a79357bfec8ff497515a8631da29f2e43 SHA-256: b1ba87448a2a90c0f377c879b8450019105afe10b973be42071d5042613147cb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting services and redirectors. The heuristic firings indicate that this PDF is part of a link farm designed to manipulate search engine results or redirect users to malicious content. The primary redirector URL identified is https://gettraff.ru/strik?keyword=falta+de+densidade+osea.

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://gettraff.ru/strik?keyword=falta+de+densidade+osea In PDF document text
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/bezivamoxe_suzukuwijepa.pdfIn PDF document text
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/5048154.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/buwoj_xeresiduk_bubadizi_gurufoko.pdfIn PDF document text
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/tedinoruline-luwukane-fidigu-xivukavikabikiv.pdfIn PDF document text
    • https://vezorobabuwej.weebly.com/uploads/1/3/0/9/130969079/jidubid-gozetizorodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369917/normal_5f89ca227197f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f8a54f305789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f8905e277fd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f89e08b48483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f87f5c2d2e13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f885d5bca80f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5f8939cd31ffd.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/630dc3.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/7445541.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/9d032bc1-56fe-4af0-a86b-bf9db1df673c/19325058429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b1058a-e7e7-47db-9ce0-53257255d3dd/xikeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd42c22-fe8a-4370-85eb-0d0e608126fb/algebra_2_a_common_core_curriculum_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd12e356-4708-4bae-ae5d-2127025dba6d/19975269965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c287219b-4517-4cce-860c-f23c5ef3bec2/vigakovakisuvaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23653094-50df-4d45-9d04-cdd3e7944f88/87790760691.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9071 4680 bytes
SHA-256: 1d0f96bd35ddd276df77c44a113f2e090a11152d89fecb31761a836eccba21f9
font_01_sfnt_off0000a069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA069 18616 bytes
SHA-256: 2d34ec178059f23fd97e27366908439c860f1d412d6eda2c6b5e518c3c8e108b
font_02_sfnt_off0000d28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28E 17412 bytes
SHA-256: b94e837e363603eaafe016220b7e3f00397dc348047bfdd245328dbad314c3c6