Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ca0c1cc31fd072…

MALICIOUS

PDF

64.6 KB Created: 2020-12-20 08:47:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d893153ab48e1f215e51fa7e77e78136 SHA-1: 97e965c9348f46c8d8ac17af63f76b4d9b6fa460 SHA-256: c4ca0c1cc31fd07203d6699d355e284258b948730e009fcad84a1f6494b58877
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple heuristics indicating malicious redirector links, specifically pointing to 'traffine.ru'. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL and the nature of the redirector link suggest a phishing or malware distribution lure, likely disguised as a free download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=funjet+multiplex+clones In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446500/normal_5fa38571447d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_5f9883a543d33.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/dojonuta/the_outsiders_by_se_hinton_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e837617-1fec-4729-9f77-43e46f94bbe6/josovagasixeladusafupojib.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fded181546cca2c41591fb2/t/5fdeed13ef8e407a9e9d36c0/1608445204109/beach_buggy_racing_mod_apk_unlocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f96448c-3ff2-40e0-984f-11c27b37e27f/bala_tripura_sundari_moola_mantra_in.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5d25a7848ba205d3a8ee5/t/5fd1469ebf104a7ed873442e/1607550631083/boku_boku_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/mongoose_ledge_2.1_womens_mountain_bike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94ead702-2f95-4ca3-a5ca-e3c4b9680cbb/45738090884.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/red_background_design_template.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3925768612547ed6ec367/t/5fc430fae18c5c478e800496/1606693119698/the_snitch_cartel_netflix.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc168c927a199023ab8f22b/t/5fca8393856f585034a41e74/1607107476278/five_below_squishmallow_names.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_off0000c041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC041 4872 bytes
SHA-256: 672b590d68851bc06d474f33e32ee8001a44d7e870d68d17aa0da1a8cdb05f32
font_01_sfnt_off0000d0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D5 10808 bytes
SHA-256: 9b4003c12e9540930ab3400fb8b2b030068ca5f2d90bda05e74af3c52779c255

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