Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa7c19b0a137034…

MALICIOUS

PDF

46.7 KB Created: 2020-10-28 09:31:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 67c236f72cc3d034ea42dda95472fe02 SHA-1: da00c4d3c6da14b0b19af14ff3a7184b5e01aca7 SHA-256: dfa7c19b0a1370343eb24f66f5c932d29c034ec1dbc9749308df15a4c76e37a5
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a large number of embedded links, many pointing to S3 buckets with PDF files. One critical heuristic identified a link to known malicious redirector infrastructure at https://gettraff.ru/strik?keyword=essence+of+undeath+wotlk. The document body also contains this URL and numerous other PDF links, suggesting a link farm or a method to distribute further malicious content. No scripts were extracted, but the overall structure and linked content indicate a malicious intent, likely related to SEO manipulation or hosting malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=essence+of+undeath+wotlk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f89cd8c73380.pdfIn PDF document text
    • https://gezeteweni.weebly.com/uploads/1/3/4/0/134040803/bururapadega.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/rizewava.pdfIn PDF document text
    • https://sobaxijuxoje.weebly.com/uploads/1/3/4/2/134235367/67d4401de5ceb.pdfIn PDF document text
    • https://kobisizosupo.weebly.com/uploads/1/3/4/3/134316778/2961873.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/a552a97af9d.pdfIn PDF document text
    • https://gewosawoma.weebly.com/uploads/1/3/0/7/130739201/runufananuwimumufo.pdfIn PDF document text
    • https://fipaziditude.weebly.com/uploads/1/3/4/4/134465794/lujozofotenafojuge.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/4ca23a4.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/gitotirajixuwinaf.pdfIn PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/06d42e8b5bcad.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/wupixufekijax/caballo_de_troya_10.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/sports_equipment_vocabulary.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/roreja.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/asserting_yourself.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/bemerujonipobu.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/variable_frequency_drive_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/physical_science_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/autocad_xref_not_showing.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/27136400266.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/duchess_of_malfi_play.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/free_sewing_books.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/97277635119.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/cryogenic_nitrogen_generation_plant.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/quantitative_seismic_interpretation.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_off0000773b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x773B 5124 bytes
SHA-256: abd06aaa7c8f214b983fbcabe699db7f18906f6c5a8ee8abd119d2a6107133c7
font_01_sfnt_off000088ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88BA 10776 bytes
SHA-256: c6f0edc784e0dbb630dc7e678036dfc14b7f5ce7c6e0f4aff288e4ad09ebb2f1

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