Malicious PDF — malware analysis report

Static analysis result for SHA-256 8261c8e5850905bd…

MALICIOUS

PDF

41.5 KB Created: 2020-10-29 04:21:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1946ba78372086699229279d46053a45 SHA-1: e63514b703cd3e0ce26fd9262789e1db81d4308d SHA-256: 8261c8e5850905bd5e9e2facc714f7d8567dbe6bb971d33b1e9bab99a12b0fcf
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector. The primary malicious URL, https://gettraff.ru/strik?keyword=cucumber+rest+assured+interview+questions, is directly linked to malicious redirector infrastructure. The document body, though heavily obfuscated, contains this URL, suggesting a lure to external malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=cucumber+rest+assured+interview+questions In PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/8979937.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/4897235.pdfIn PDF document text
    • https://vedabigejiko.weebly.com/uploads/1/3/1/4/131438046/jexiledekomira-sexivab-fosewafuvusazet-turasenezesaxa.pdfIn PDF document text
    • https://genamimiwovem.weebly.com/uploads/1/3/1/6/131636881/goxaxeburepot.pdfIn PDF document text
    • https://zuxizakubapepo.weebly.com/uploads/1/3/4/3/134317428/6937235.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/aa6ff439-5a73-4c46-8abf-54b3e41fa000/diners_drive_ins_and_dives_memphis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6898/3969/files/manual_seat_ibiza_style_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/tesiredofaselusita.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/zebepixizomepu.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/98023766656.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/artificial_intelligence_norvig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3931e22b-6842-4a0d-9c9d-ad48818395b0/33490682045.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/digifabobesubaxaf.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/zapupokivuwikukoroka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ae20f09-f49d-421f-adc4-61ae49f8c158/rifizefenolu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5726/8886/files/pokiwej.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/49562876693.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/zomuxefuwuxixewitapafa.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/bagirirovisepofepevu.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/84955092763.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/balantidium_coli_en_cerdos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee188d89-fdc1-46a3-84c1-00658e382485/.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/sales_engineer_resume_sample.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_off000065b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B7 5376 bytes
SHA-256: 85bd5efe13f11597b4387490ef99277066253c54099894ecf022fc6130ebd661
font_01_sfnt_off000077ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77EF 9704 bytes
SHA-256: ba623e4316609bbbcdaf79f8316dc78395a70c0c7c729a586d3e7f66eac26533

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