Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba77f2f981d3531e…

MALICIOUS

PDF

65.1 KB Created: 2020-12-21 04:02:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3c6d29325702e7360dd2d41a195f2415 SHA-1: d6ad7b865398eff5c18cf64cd202bc27a151019b SHA-256: ba77f2f981d3531e14435929fae7a50a5313145d240a0d5ab1e2c8eae5179fdb
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary URL pointing to a site offering game mod downloads. The ML classifier strongly indicated maliciousness, and the presence of a PDF URI heuristic suggests the document is designed to redirect users to external resources. While no scripts were directly extracted, the PDF structure and link farm heuristic point towards a malicious intent to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/strik?utm_term=defenders+2+tower+defense+mod+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404523/normal_5faf8aea5cbe2.pdfIn PDF document text
    • https://bojojibapofaz.weebly.com/uploads/1/3/4/4/134478515/wenigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f9075fe34eed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451027/normal_5fbdfff31dacc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_5fb5b45156b89.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/5ee60302-b721-42fe-a51e-6b52953f28e6/95763464123.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/statistical_learning_stanford.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/098a4ba2-b7ea-4a2c-8a0f-bf60f7efc308/shri_hanuman_amritwani_part_2_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7726376-21eb-4d16-92e8-7db744e4b4af/cocawap_music_mp3_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0564840-ae8d-4569-aa56-f4a3a28473fc/85076899247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f2ec01-5efb-4449-8828-520bdb26167a/mizuvifivipumada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e86c71d4-30cb-498c-b85c-e93727ef3cbe/danotumisasurazufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3027d236-061e-43cd-9f2c-e8165d410736/72059308950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c85a4c00-e74b-49de-af65-9a37a43e1d3a/musica_cristiana_alegres_letras.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_off0000c12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12E 5472 bytes
SHA-256: 64a008198ad3c06e90629b75989ee30138457624d091dd1b8523837ebe1831d0
font_01_sfnt_off0000d3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CF 10328 bytes
SHA-256: e511648e67919db25ee6ebb96ad94bdc640c0a986d86875564d5102386a207c6

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