Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6b03345d3bae09…

MALICIOUS

PDF

36.5 KB Created: 2020-11-05 22:42:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 75260d8f18befb33b475bc433e48da29 SHA-1: ef3a3395875eda53d2659ce02cd9d0b3f7a4876f SHA-256: 2c6b03345d3bae09c2aa1ba9fd768fd90c68ce95c8de6b7f853ff412f4c90eb4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to S3 buckets and other domains, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://trafftec.ru/aws?keyword=12.2+matrix+multiplication+worksheet+answers', is presented within the document body, disguised as a relevant search result. The ML classifier strongly indicated maliciousness, supporting the interpretation of this document as a lure.

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://trafftec.ru/aws?keyword=12.2+matrix+multiplication+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393904/normal_5f9be29924309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410216/normal_5fa30d1c14061.pdfIn PDF document text
    • https://femevidawivuk.weebly.com/uploads/1/3/1/0/131071063/245342.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/lakadutof/12872329163.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/wefegivevo.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/angry_bird_rio_game_apps_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/39850215082.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/safety_reliability_and_risk_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d2f0d35-c597-405d-b0a4-b2d5f668743c/54812601643.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/enigma_otiliei_tema_si_viziunea.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/students_absenteeism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2831f2bf-7b94-4415-b5fa-774565038939/93206263344.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/android_app_development_2018.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_off0000498b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x498B 5516 bytes
SHA-256: b77bbaa177be45d561a4fbd8f525a2efb308898329e5dbeaaf74ba042274df98
font_01_sfnt_off00005c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C43 11352 bytes
SHA-256: 404b3a6d054bf987383565cd67c06c4982ca27c1479043574a50dc68be991529