Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5eafc8359295147…

MALICIOUS

PDF

46.6 KB Created: 2020-11-03 06:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bfee9897ec15d1c7b18a674409c71539 SHA-1: ef955a89a698cd98e7b8ca20feb13ae723a90977 SHA-256: f5eafc83592951474b28fcda69290e2e1cac5bd72101ff0aca6858c61181b6d5
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URL, 'https://cctraff.ru/strik?keyword=teacher+of+the+year+sample+nomination+letters', is the primary indicator of malicious intent, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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/strik?keyword=teacher+of+the+year+sample+nomination+letters In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386073/normal_5fa01a3649f3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377933/normal_5fa0d32215f8a.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/turip/character_design_quarterly_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0509/8094/6107/files/37177289701.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/262910461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee66cba0-317d-4170-8b88-611c2ee3e6d3/oh_susanna_lyrics_and_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14900aa0-dfc1-481a-af3d-a50a1557e889/76656950694.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/7808/2495/files/98434967190.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8967/3883/files/apk_zombie_frontier_3_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3322e4ed-2a87-4ba5-9713-a6ee54138b30/gefopopakumawuperudusapa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9961/1047/files/you_re_approaching_me_text.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8326/6746/files/bozededevojogasedu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/4094/8383/files/nulazovezer.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_off0000778e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x778E 5308 bytes
SHA-256: 73f31d6a9fa00b8ead7ee25d1b89f981c9b70a64b81be52938229cd2ac4b41bb
font_01_sfnt_off0000897a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x897A 10488 bytes
SHA-256: 010eb4191f7f2663d94054469112e89af0ea0860c9a78e906ae8cb0423169d08

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