Malicious PDF — malware analysis report

Static analysis result for SHA-256 48655c54291700db…

MALICIOUS

PDF

63.6 KB Created: 2020-11-06 21:53:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 787ade43f196890b8c2a701c26c85a92 SHA-1: b807a3fdf68f5dedfa10f672e46a52c17a36429a SHA-256: 48655c54291700db66906e9c896029a259d172adb394a656bee023719e4b7e0b
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 pointing to disposable hosting and forming a link farm. One of the embedded URLs, https://gettraff.ru/aws?keyword=wow+classic+macros+priest, is identified as a known malicious redirector. 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://gettraff.ru/aws?keyword=wow+classic+macros+priest In PDF document text
    • https://voganolov.weebly.com/uploads/1/3/4/3/134372868/2545363.pdfIn PDF document text
    • https://sebezudo.weebly.com/uploads/1/3/4/0/134042436/jogavoparedovun-kedotawoxasaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://pafegum.files.wordpress.com/2020/11/xumakosokidazok.pdfIn PDF document text
    • https://fosigitivi.files.wordpress.com/2020/11/dinonarononodarowu.pdfIn PDF document text
    • https://gukoxawe.files.wordpress.com/2020/11/24807084766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca7f6cc4-fe91-4a9e-a05e-b6583b81514a/32742788267.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/26681562785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4adf28ba-c1f0-47fd-bc92-fe2563da9734/sokajokibigipelidanezaz.pdfIn PDF document text
    • https://rovamidenube.files.wordpress.com/2020/11/manual_de_servicio_toyota_tercel_1993.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/7303636109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/339523ff-8a25-4716-b5e7-3bd2cad0fee5/15122404215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cfb6c76-5581-4ec4-ae4b-67fb2f046072/25685247468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcf265c1-65f9-4faf-9ca7-5d30ee5ac7c6/sigmascape_v4_savage_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff15df13-bda3-41b2-8b42-e1a245dfa00e/fogabogosidalisore.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_off0000b86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86E 5184 bytes
SHA-256: 5f3af093de0537c071fe3703961ce1f6c01b47c0fe83d519449200735d1d165a
font_01_sfnt_off0000ca13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA13 11760 bytes
SHA-256: a16fb2f28cb33293cf1e1568ddedfb33776ab934d674a1f50aab9450e68e4ff4

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