Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c1f9d7eb24b689…

MALICIOUS

PDF

72.7 KB Created: 2020-12-24 00:17:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e410acfaf74427c413915dbadc10e04b SHA-1: d8605d690380d5248a0123777b66a73adcc961b8 SHA-256: 19c1f9d7eb24b689e0a62df42d9e762a1d759e12980bca985d38fd3ea31e3f6c
162 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 'traffmen.ru'. Additionally, ML classification strongly indicates maliciousness, and ClamAV detected it as a phishing trojan. The document body, though heavily obfuscated, contains text related to 'free block puzzle games for ipad', suggesting a lure to entice users to click the malicious link.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffmen.ru/strik?utm_term=free+block+puzzle+games+for+ipad In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f874616062f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_5f99026610860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5f8d2371d9bcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369327/normal_5fdf2c29a5a86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392667/normal_5fa61e7332a04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454041/normal_5fdf140c9f349.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/53442687-905d-4696-ae93-fddb4d069ebe/pomomuzadixiwujete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5748f03-7b72-47a8-882a-0d664d537f60/grey_concrete_powder_minecraft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f570cb0-e4d2-4bcd-be0e-af421476364d/10520507911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd55b313-320c-44ca-9e9f-64b9b24a71db/pokemon_insurgence_post_game_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/687cff2c-aef3-484e-9447-a5fd947c35ad/louis_armstrong_quotes.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_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 5684 bytes
SHA-256: 8634dfedf34658cb4e3a0b5344f7951058c9ccf048b58f7ea56e9091f41b2016
font_01_sfnt_off0000f088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 10956 bytes
SHA-256: 6f3a1d940f7091f0753905e1d557c500b4782171b21226fcd05f68545c5a5727

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