Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ca267bad7a47e1…

MALICIOUS

PDF

44.0 KB Created: 2020-10-28 18:40:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1dc8595babac546ec5e4ede61849312f SHA-1: 247fa8541dd55af599356e481df9aca8fe1a227a SHA-256: d2ca267bad7a47e164a9d81e227be0530ca49540316c600264781dc695ef1adc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The document body, though heavily obfuscated, contains a URL that is also present in the link farm, suggesting a coordinated effort to drive traffic to malicious sites. The ML classifier strongly indicated maliciousness, supporting the assessment of a link farm attack.

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=sunset+western+garden+book+9th+edition In PDF document text
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/sexofuwe.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/9781852.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/607413.pdfIn PDF document text
    • https://mojenosude.weebly.com/uploads/1/3/1/3/131382274/3837160.pdfIn PDF document text
    • https://galuxenezinex.weebly.com/uploads/1/3/4/4/134437763/6f8be723f7.pdfIn PDF document text
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/liwerono.pdfIn PDF document text
    • https://sejejuno.weebly.com/uploads/1/3/4/4/134447194/3623496.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/7d6ede4367e1.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/a5799085-d8d4-4d7f-8c5e-c56788fbcd5d/jinikawepesipelerufimibin.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/email_writing_skills_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e96517c6-fc08-40a1-bbf5-5ea3374e3f81/4446166014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ef5bc02-4836-4b28-8b51-10fd601bdfc2/50956919915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b6495d-d44f-4eb3-a674-0baf03017ec1/17881630269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53c9d27c-0ef3-4ee0-9d7f-42094a31f127/98778822669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bae369a-5e9d-4a87-896b-41ef1364de06/42861104528.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/22289179833.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/the_ransom_of_red_chief_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f8b1f32-8e66-4818-9bd6-c17514a1edf7/23213495940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/900298c2-6835-4858-8abb-fcabe3a232ce/solar_electricity_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c31c362-e92d-45bd-8073-f6d3d6ef41d9/68253067708.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/cambridge_latin_course_book_3_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/durili.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_off00006d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D58 5612 bytes
SHA-256: 9ed02ef0be2fb3e78f4bec28b3697dc6c34bece16a8a43b2222c601d9838d477
font_01_sfnt_off0000806b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x806B 9952 bytes
SHA-256: 6262f56acacc048928883668f9589e37400439e95b667c78a1744af0c43bbfc3