Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3d7cb0b09c6739…

MALICIOUS

PDF

50.7 KB Created: 2020-10-28 15:08:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 57d369411c70e7866b3dfd83d7be9da1 SHA-1: d6530628373f79fcc22c1d2709804c6aa1dfab01 SHA-256: 6c3d7cb0b09c673992feb3d658fbde986c977ba8bd06a151dac41367e5240618
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a clear reference to the malicious URL, suggesting a lure for users seeking a specific PDF. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/strik?keyword=a+gentle+introduction+to+stata+fifth+edition+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378382/normal_5f92f99075587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373757/normal_5f8c5f74c3ad7.pdfIn PDF document text
    • https://zuxuzesis.weebly.com/uploads/1/3/1/4/131438019/rumitijov-volez-kuxibukefipurab.pdfIn PDF document text
    • https://lewotivegil.weebly.com/uploads/1/3/4/3/134320996/mebijixiv.pdfIn PDF document text
    • https://meboguvogo.weebly.com/uploads/1/3/1/4/131437667/9719367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409609/normal_5f970e9509ead.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/nadikowazijajutulaga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f87bebbec17c.pdfIn PDF document text
    • https://jufopikigon.weebly.com/uploads/1/3/4/3/134309667/3100292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386620/normal_5f8e5f5e45772.pdfIn PDF document text
    • https://betoxugibujimiv.weebly.com/uploads/1/3/1/0/131071043/buvavutafepozer.pdfIn PDF document text
    • https://nuzixusimupe.weebly.com/uploads/1/3/4/3/134306281/5287833.pdfIn PDF document text
    • https://tadeganerusoza.weebly.com/uploads/1/3/1/4/131438541/376efe1a04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f8bd1373aa0f.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/1/0503/3813/6232/files/retaining_wall_foundation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0315/8433/files/the_term_definite_duration_refers_to.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8029/4298/files/converter_digitalizado_em_word_editavel_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3905/4231/files/68098999700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc446504-37cb-4f0a-a41f-7b706ed8d3aa/tivopemer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06f28b5d-a099-49cc-887e-69785d001d3f/90976299814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de6a34e3-9377-4ad5-a0d8-2c3d9ff1a528/39744615481.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5112/9278/files/47306597416.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_off000083be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83BE 5496 bytes
SHA-256: f95d23e765d9bcce6b890c12047e836faea774d2200880da04f2e16d28b7fd07
font_01_sfnt_off00009680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9680 11760 bytes
SHA-256: 00e51890165ed0f71decac70ef2788a7c391d8aed3e927cffc24213d68ac77f6