Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b1d793ef7b531f…

MALICIOUS

PDF

74.4 KB Created: 2021-01-16 08:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3eb2ab85b989653accceb75cb83704a4 SHA-1: 7a34ae1c82cd90283a91ec515691257b3fbce15f SHA-256: 87b1d793ef7b531f1ca84c9f8bbf494020be688f61cb89c7d7f8ac132844488a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'traffine.ru'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL suggests an attempt to lure the user to a compromised site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://traffine.ru/123?utm_term=chapman+high+school+football+roster In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377401/normal_5f8df511a847d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f8735d8ef8ec.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/FLxG1jg/nirediku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485693/normal_5ff2066c41f81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370543/normal_5f90908b0fd95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460688/normal_5fee3d6dedc72.pdfIn PDF document text
    • https://cdn.sqhk.co/wibepudib/hxnjgif/healthy_eating_tips_during_covid.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/zukogi/formation_of_carbonic_acid_in_blood.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/corporation_bank_atm_complaint_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/94053398253.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/sql_server_express_2016_with_tools.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/joining_sentences_with_conjunctive_adverbs_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/jon_snow_and_ygritte_episode_guide.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_off0000e5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B6 5476 bytes
SHA-256: c3fc1bda79bf0b0dbf4f1c821119fc614c381d5186167db90dd3f38818e6af06
font_01_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 10740 bytes
SHA-256: eb286ab724264f931fa8df95c818c9f481ba5fd6523c4fd4766057e180405834

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