Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef74ed523cee5ca…

MALICIOUS

PDF

49.4 KB Created: 2020-10-15 06:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 38ba8af00df7f51d759bb6872a75fd9e SHA-1: e150fbb7ed28658dfca5c13e0ab5b2edc21c4fc1 SHA-256: 0ef74ed523cee5ca9b3b3ca0a910909dfdc306d4d85da53e60a931cb0c7f7158
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristics confirm the presence of a link farm designed to redirect users to potentially harmful sites. The document body itself is heavily obfuscated and contains embedded URLs, suggesting an attempt to disguise the malicious intent.

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/123?keyword=notebook+page+design+pdf In PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/7099023.pdfIn PDF document text
    • https://wonigebegi.weebly.com/uploads/1/3/1/6/131606731/xodasoniroduga.pdfIn PDF document text
    • https://gikoberi.weebly.com/uploads/1/3/0/9/130969260/movozitesuwa.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/3905791.pdfIn PDF document text
    • https://tajurasexir.weebly.com/uploads/1/3/1/6/131606020/forukoxofi_metizubaxanava_bezurese_lirekox.pdfIn PDF document text
    • https://site-1041866.mozfiles.com/files/1041866/durimid.pdfIn PDF document text
    • https://site-1039472.mozfiles.com/files/1039472/1643257507.pdfIn PDF document text
    • https://site-1038670.mozfiles.com/files/1038670/sisepolojigizuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5f87b8ebf35a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5f875cd9dfd74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f870c65915ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368228/normal_5f877754dc194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f873523aba11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5f87b6968288e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368954/normal_5f87a4e323fe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368964/normal_5f87b3cf72a0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f870b18d7fa2.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/324e023f-7878-49b3-8390-506dd97dac08/mowibawajozugugojad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/773d1b2a-0167-4109-b55a-b82e27e938b8/gujabemazarowixovusatetom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f596014-6b51-4e9a-8b7a-21cb71a7a1a7/87317254056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d84a6ea3-d03c-4d19-ba0c-252e576d5307/38369861504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97f1c5f5-af60-4122-b183-e0cd566c110b/nifadosojopax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/844daa1e-e204-4128-8906-ebcb895136f9/nekevimisejegeligejedato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac8ced50-7f08-4ee5-9455-d81e23e429d6/67621963999.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_off00008050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8050 5256 bytes
SHA-256: 64706b3ce43156a97001f8bab012f37e5ec616674c6cba011a92047459c769e2
font_01_sfnt_off00009247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9247 11200 bytes
SHA-256: 84a0e668788d4788750a3980a0f99b20f3f2a0528d569b734a3e9d15d102b6f7