Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f9d363b808c5cf…

MALICIOUS

PDF

80.8 KB Created: 2021-01-22 06:16:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: d8db131e208cbc31823b177590191987 SHA-1: 9f4ed6b923104e6b1ce3dd9425282643c0bf3d41 SHA-256: 50f9d363b808c5cf5c1affc84497e1cf09150f8d14ab4c2f25a2d70c5a4a7dc0
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/aws?utm_term=mental+arithmetic+1+answers'. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be related to 'Mental arithmetic 1 answers', suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/aws?utm_term=mental+arithmetic+1+answers In PDF document text
    • https://cdn.sqhk.co/pabulibig/HgfWhaS/43311762978.pdfIn PDF document text
    • https://cdn.sqhk.co/ruduligived/VKjiprR/zirubifawadawoba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370529/normal_5fce9383be657.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/0oYygez/86121717174.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/jHhcjh2/38705853047.pdfIn PDF document text
    • https://cdn.sqhk.co/walumupo/hcugguP/water_marbling_nails_tips.pdfIn PDF document text
    • http://zazuvivilug.iblogger.org/rediduwonularojubinaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451365/normal_5ff85dfa81fc4.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/mefadedosuw/mexijisolibana.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/army_amino_latest_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/pezuv.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/22799647788.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/fb_video_er_pc.pdfIn PDF document text
    • http://ridurosumebo.epizy.com/kodiwexetafud.pdfIn PDF document text
    • http://supetok.rf.gd/60080023910.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/zoxikinelij.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/checkers_burgers_nutritional_information.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_off0000fef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 5188 bytes
SHA-256: 90529313e12995238e90de203fe121afa164ba87d816cdc53921ccca8519c9fe
font_01_sfnt_off00011090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11090 10956 bytes
SHA-256: edc90ee368204abf34b27a0be2c9f2ceb565880e21a7efebc8d1eccb9d7674a9

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