Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b509152d6f24e5b…

MALICIOUS

PDF

71.3 KB Created: 2021-01-09 09:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 817ed9cbe749b77e3250a798a3e00827 SHA-1: 73f6bd4851ccc0dccb6815d7de11f201fea8c911 SHA-256: 4b509152d6f24e5b9eb62338e4657e64a0e76b6796fafce84aecdc1b3bbef45c
174 Risk Score

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 'ggtraff.ru'. This, combined with a high ML score and ClamAV detection, strongly indicates malicious intent. The document body, though partially corrupted, contains text related to 'Workkeys test scores login', suggesting a phishing lure to steal credentials. The presence of embedded URLs and the nature of the redirector link point towards an attempt to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ggtraff.ru/123?utm_term=workkeys+test+scores+login In PDF document text
    • https://cdn.sqhk.co/bobimugura/47ge4Ao/toca_hair_salon_3_apk_for_ios.pdfIn PDF document text
    • https://ranenowubugipo.weebly.com/uploads/1/3/4/0/134040983/7148387.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/sokukaf.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/hckKP8x/aww_pobrecito_translation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487201/normal_5fd31c301d6c5.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/jkjiXih/36663886697.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/bubisifapagefe/game_resident_evil_4_biohazard_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/avast_premier_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f418077e-6537-406c-a07a-4c2016c49685/pole_et_flux_de_la_mondialisation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f471decf-06de-4470-a2ab-3c93938c4430/74048554322.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/metal_frame_pool_clearance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6534c07-dfcf-465b-948a-e04d03e2a2e5/nogipoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/819c69b7-4c60-449c-9873-d653e32b4bde/meramec_bluffs_senior_living.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/labor_induction_acog_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/96392623556.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_off0000dbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCA 4936 bytes
SHA-256: 80e8be4c28b9475c511b8e4c24efcb704fb73a00741a0acfada004ca95aafa8e
font_01_sfnt_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 10504 bytes
SHA-256: 2dc8eaabd8425c83ed75ae9fae90970fbbd5735b684218931a3b71519c255357

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