Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e9ff8142881e9a…

MALICIOUS

PDF

52.0 KB Created: 2020-11-06 12:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 301c4c475846cd4fc5a2b7fa989ba53b SHA-1: ecb87b545dea87d5f3df81f04ff953f659a8129b SHA-256: 98e9ff8142881e9a9025ebd10bafcf3b44d7afeb5188afde97c2f69da9b1768d
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are dynamically generated, suggesting a link farm or SEO spamming operation. The document body and embedded links point to various URLs, including one that appears to be a tracking or redirect URL. The presence of numerous external links and the ML classifier's high confidence score indicate a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/strik?keyword=the+worst+people+in+hollywood PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381302/normal_5fa40bad64c59.pdfIn PDF document text
    • https://woliwejimagevin.weebly.com/uploads/1/3/4/3/134319070/kowamibu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384039/normal_5f92021c5e859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_5f8949c3a285f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377902/normal_5f93ccaed74b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372967/normal_5f976901091ea.pdfIn PDF document text
    • https://turikiripejuz.weebly.com/uploads/1/3/4/5/134501804/3218862.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sivanira/ralopinedativot.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/power_of_six.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/personal_experience_stories_from_9_11.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/scarab_of_protection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ea5abbc-40a1-446e-8a72-e551a6b112c9/roperivitutigaxetomutexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2937055d-a565-41be-a6b3-556c90899232/fevumibezevegutidox.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_off00008a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4F 4980 bytes
SHA-256: 014c286632e4477b732603bf852fd89f82688bf421b43f9f46e49c2a7cb3be17
font_01_sfnt_off00009b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B52 11504 bytes
SHA-256: 04e3e1ac62e88ebcea0a127a1e21bdf39be5944c14cc061530306d177993ed67