Malicious PDF — malware analysis report

Static analysis result for SHA-256 a825ba20a1eff7e6…

MALICIOUS

PDF

88.1 KB Created: 2020-12-31 11:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52eabc18f73d3212a8fa7011d47080ac SHA-1: 756aeb394d5b9b2e34cea20aad7ea7726505ecd3 SHA-256: a825ba20a1eff7e62bd3658684b96e076ddabc837aac890bb7786efaa563d0ac
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though obfuscated, contains text related to 'Minecraft world seeds', suggesting a lure to attract users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/strik?utm_term=minecraft+world+seeds+pc+1.+7.+10
    • https://lomameleni.weebly.com/uploads/1/3/4/5/134597964/vipokamu-vugomakawir.pdf
    • https://nifadajenekipib.weebly.com/uploads/1/3/4/3/134305148/tabom_sugixomed_nizixemixogare_wujitiku.pdf
    • https://bekujorukop.weebly.com/uploads/1/3/4/0/134016765/7486bf02.pdf
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/edcfab06b1a70.pdf
    • https://gaxasexafarud.weebly.com/uploads/1/3/4/5/134590452/tisobisijivizi_vidoxaxutu_gedemikudoxubup_tinobil.pdf
    • https://zipalusub.weebly.com/uploads/1/3/4/3/134343211/6942ad99ee1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dovulavavo/newevuvudofim.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/excelsior_middle_school_marion_iowa.pdf
    • https://s3.amazonaws.com/pesetufavo/congratulations_on_your_promotion_template.pdf
    • https://s3.amazonaws.com/mivokozibu/designing_great_beers_download_free.pdf
    • https://uploads.strikinglycdn.com/files/99edc1cd-509a-444c-bc8a-b7415441f6d7/amharic_alphabet_download.pdf
    • https://s3.amazonaws.com/rijaliwiguvex/la_clase_de_espanol_es_la_mediodia.pdf
    • https://uploads.strikinglycdn.com/files/b605684e-f13f-451c-b8fc-9460d66ea090/ticker_tape_parade_yankees.pdf
    • https://s3.amazonaws.com/gosete/watermelon_nutrition_information.pdf
    • https://s3.amazonaws.com/jinabisura/33513023361.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c23.bin
9fe539b7d224f0119211d34c067f799a0799526812c7ed1565960c201a97d0a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C23 5552 bytes
font_01_sfnt_off00012f45.bin
4404e018f8684cf798b913ebecfbe959da125ab31037baa188744d68d2c955f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F45 10448 bytes

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