Malicious PDF — malware analysis report

Static analysis result for SHA-256 da51589dea0c05d5…

MALICIOUS

PDF

74.2 KB Created: 2020-11-19 02:02:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5494946d91c4242287862387270ef68 SHA-1: 5dd689c2b964f78e11834203ee3fbf59e977a77a SHA-256: da51589dea0c05d528ca88be21f94769fedc78f2ec8d5c7f0756ba14fef809c5
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating an attempt to phish or deliver malware. The embedded URL `https://cctraff.ru/strik?utm_term=christmas+carol+emoji+pictionary+answers` is flagged as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Christmas carol emoji pictionary answers'. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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=christmas+carol+emoji+pictionary+answers
    • https://cdn-cms.f-static.net/uploads/4388157/normal_5fb5200e822ac.pdf
    • https://cdn-cms.f-static.net/uploads/4374968/normal_5f95338e07ddb.pdf
    • https://cdn-cms.f-static.net/uploads/4392864/normal_5faacd3c592b5.pdf
    • https://cdn-cms.f-static.net/uploads/4369149/normal_5f883670a10a2.pdf
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5f92d145113dc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bewibiwat/pubidixunagegaxanuduxufen.pdf
    • https://s3.amazonaws.com/nitajosasa/mr._michael_beckett.pdf
    • https://uploads.strikinglycdn.com/files/911d239b-0012-4691-9c5d-f345b5c82981/developing_backbone_js_applications.pdf
    • https://uploads.strikinglycdn.com/files/5de5be50-c8fc-4dc3-8657-21c7dbd4eeae/thomas_hobbes_leviathan_zet.pdf
    • https://s3.amazonaws.com/wixamupelinere/vulugokoxuwixabexelelub.pdf
    • https://uploads.strikinglycdn.com/files/5ce5aa4e-9844-4f66-8b5f-ec32b7378c37/revitalift_l_oreal_eye.pdf
    • https://s3.amazonaws.com/vibuvomomuv/bamug.pdf
    • https://s3.amazonaws.com/fasanag/fazeligukimegasepuvu.pdf
    • https://s3.amazonaws.com/sedimeraxufi/wosolitotekugawa.pdf
    • https://s3.amazonaws.com/fulazelof/aad_psoriasis_guidelines.pdf
    • https://s3.amazonaws.com/jikopot/71994626001.pdf
    • https://s3.amazonaws.com/jovekus/bee_balm_tea_benefits.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cda2.bin
607a30be342605b5d499f34c99763b5563d98e98d3e78a0d620f3f0c5e3dfe94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA2 5348 bytes
font_01_sfnt_off0000dfb6.bin
a0a4957a422ccad9aed183678f9f6cde4bcdd16483cd5152f42c54e6f9d8d9c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB6 11336 bytes
font_02_sfnt_off00010626.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 16204 bytes

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