Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd13c0505a7d96a…

MALICIOUS

PDF

35.9 KB Created: 2020-11-07 05:19:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 696e7500d6c0c434623e5a4008d1b406 SHA-1: 5c9e7497b1c401ade16328a8173901d7456bd6f4 SHA-256: 1dd13c0505a7d96a18ed3d4ccf196c8f435f343db634d18113dac6ac3687e55a
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded URLs, with one prominently featuring a lure for "Dragon city free gem generator". This URL, https://trafffi.ru/aws?keyword=dragon+city+free+gem+generator, is flagged as an external URI and is part of a link farm on disposable hosting, indicating a likely phishing or spamming attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/aws?keyword=dragon+city+free+gem+generator PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/forupokisip/nemogitigowi.pdfIn PDF document text
    • https://ziziwugo.files.wordpress.com/2020/11/wokonakizumezowegi.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/95631071610.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/married_at_first_sight_mia_warrant.pdfIn PDF document text
    • https://vumizekajuri.files.wordpress.com/2020/11/82813800905.pdfIn PDF document text
    • https://saridejawe.files.wordpress.com/2020/11/mupinakekasepibumejo.pdfIn PDF document text
    • https://xelinatuki.files.wordpress.com/2020/11/12873235441.pdfIn PDF document text
    • https://japegotof.files.wordpress.com/2020/11/zediminoregujivot.pdfIn PDF document text
    • https://rezekine.files.wordpress.com/2020/11/tatojesanawav.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/57038068413.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/cellular_respiration_quiz.pdfIn PDF document text
    • https://sirilab.files.wordpress.com/2020/11/tabifenid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d86f465-8da5-4a4c-a263-6b11a4701a10/maroo_of_the_winter_caves_summary.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_off00004f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F28 5092 bytes
SHA-256: 5ad62ecad669127c057e49d8adc4da7ca14d5d645499900d462f4cfcc92f226b
font_01_sfnt_off0000607a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x607A 10052 bytes
SHA-256: b1852576b7bcca1b8a87a4f551e19865eb155239450f10a1a2b98ad0562f31ae

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