Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa643bbcf9f9979…

MALICIOUS

PDF

69.6 KB Created: 2020-12-22 22:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 78e75c8613398a502b20f4c9597bc22e SHA-1: 7d305a6ca8ba1d145d7840bc86046d28adedc54c SHA-256: bfa643bbcf9f99794a56837ba9dbeff61f30782c788c6b56327c7577adbbbf5c
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 heuristics indicating it's a malicious redirector, specifically designed for phishing or malware distribution. The embedded URL, 'https://cctraff.ru/strik?utm_term=bloon+tower+defense+5+hacked+arcadeprehacks', is identified as a malicious redirector, likely used to lure victims with a fake game download. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cctraff.ru/strik?utm_term=bloon+tower+defense+5+hacked+arcadeprehacks In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_5faaf4a3dd812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496592/normal_5fb7294c4d374.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470687/normal_5fcb64af345c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403408/normal_5fca96b765e9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377381/normal_5f89d24b563d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc646132bbd7406582b26cc/t/5fcb97a164036b614390592f/1607178150426/knives_chau_blue_hair.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4b379d79364840844717/1606372152045/mejasu.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/17784792547.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e006a879396864083677/t/5fc13f6f9d79364840bb32aa/1606500208787/when_two_atoms_form_a_chemical_bond_the_expected_result_is_that_the_electrons.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/despacito_chords_piano_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CB 3116 bytes
SHA-256: 9c95d31a91dbd6641f0c74244229e85192d69cd42f19872a0938cb6121098e58
font_01_sfnt_off0000cffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFC 5572 bytes
SHA-256: 981ac2b2733bf4257a387bc237e507b2792a94937f71a87b0440c3ce580c4529
font_02_sfnt_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 11424 bytes
SHA-256: 548d5224bdccffe00f120bc33830ee7727fc1cdb1ea30034b1001e7936ff5862

Open this report in the interactive analyzer, or submit your own file for analysis.