Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b76d458e1d63404…

MALICIOUS

PDF

70.3 KB Created: 2020-12-23 02:08:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3603d260d819ede1d342c922e7393fe4 SHA-1: 9118ba8f0da32695c702e60aeef9410d22db3e1e SHA-256: 8b76d458e1d6340476c821722b1b53ded9d8b4c4a6e9fda52ab427cbdb293e1d
154 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, traffmen.ru, which is likely used to deliver a secondary payload or phish for credentials. The document body, though heavily obfuscated, contains text related to 'Subway surfers codes 2020 cambridge', suggesting a lure to attract users interested in game-related content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/strik?utm_term=subway+surfers+codes+2020+cambridge In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379355/normal_5f8b1e349b8f0.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/xamibudasagas/fairy_tail_elfman_age.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/movedorewaz.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/febarenemerekuvak.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/what_is_protocol_omega_in_travelers.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/81251286815.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5898f8139af037664907f/t/5fc8e87b8fd43c0a66ecf11f/1607002235685/23119448442.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf582361e25426e12fc2e3/1606375459736/vikatunurofawigujopugisu.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/zatevolomeka.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc703795c272238a8179ca4/t/5fd657f45b1f6f7539d5a18d/1607882741037/shazam_apk_pro_2019.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce2a0956a976706ec556bd/t/5fd13215cc45be394265b4a8/1607545365239/farm_fruit_pop_party_time_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/37421435727.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/oxford_achievers_app.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/sisevaw.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/98347432233.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_off0000d1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DB 6020 bytes
SHA-256: 031f7bf5ebc839941d443dac8da571951944cae2a468765994d23937b683ac9b
font_01_sfnt_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 11264 bytes
SHA-256: 2e9204245b90d394a56c59214b66ac2c985911b6173a03131c70efcd8ca24736

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