Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca643c8ef907624c…

MALICIOUS

PDF

46.3 KB Created: 2020-10-25 07:13:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c36b1d6fe1db5bd2757a965f949a4311 SHA-1: 720ca085ff0a6618d5ce6ee59ee9380c23b3f187 SHA-256: ca643c8ef907624c1a7d3a844c3c3ea7ed59c32a8ea53e4b2491dadb432373ba
154 Risk Score

Malware Insights

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

The PDF contains embedded links disguised as document content, specifically 'install joist hangers instructions'. One of these links, 'https://ttraff.club/123?keyword=install+joist+hangers+instructions', is identified as a malicious redirector. The presence of numerous external PDF links, many pointing to benign content on S3, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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://ttraff.club/123?keyword=install+joist+hangers+instructions In PDF document text
    • https://somanenor.weebly.com/uploads/1/3/4/4/134472611/mejaz.pdfIn PDF document text
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/sipaviwo-kesotaw.pdfIn PDF document text
    • https://sewuvemap.weebly.com/uploads/1/3/4/3/134377394/sopatirufuti.pdfIn PDF document text
    • https://zuxuzesis.weebly.com/uploads/1/3/1/4/131438019/a80a069777.pdfIn PDF document text
    • https://sasakafu.weebly.com/uploads/1/3/4/3/134371045/fobov.pdfIn PDF document text
    • https://zabugusu.weebly.com/uploads/1/3/4/3/134311035/998092.pdfIn PDF document text
    • https://biwefixosepow.weebly.com/uploads/1/3/4/3/134334309/basekabu.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/8cc5a8b9ba.pdfIn PDF document text
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/760517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378406/normal_5f8ab4910e676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370302/normal_5f94f51cb5a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_5f8bedd3a9c76.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/bededuxotulapil/xofedirorilan.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/pijuluwekapumiwunalegawe.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/vaxekurisofunenuji.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/advantages_of_computers_in_education.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/bible_study_guide_tagalog.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/alagappan_general_medicine_book.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/cazadores_de_sombras_origenes_angel_mecanico.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/vonevo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3931/5880/files/youtube_to_mp3_high_quality_320kbps_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8650/1806/files/ipl_2020_schedule_sunrisers_hyderabad_team.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8742/8257/files/52654434064.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2611/5481/files/zudawotasuronomorodumemev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7215/9389/files/46876752294.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_off0000759e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x759E 5076 bytes
SHA-256: cf1b68310a1b9f3e37e83358a0054503eb209880fe46fd8614ec2b0118324436
font_01_sfnt_off000086de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86DE 10840 bytes
SHA-256: 984a8708dd4ccea98c698f66ce340bdc55c8de3359534dc9bf672490f8590189

Open this report in the interactive analyzer, or submit your own file for analysis.