Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a9271e4a9759ff…

MALICIOUS

PDF

70.4 KB Created: 2020-12-18 04:06:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 51eae5206fed66a4a8a53a5d798f0d92 SHA-1: 954b0633f8175e8dd5893763f1836dd54ffd9ef9 SHA-256: 94a9271e4a9759ff4e2381b1604a6abe0ea22bc95630cf5f52bf387e46cefe25
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 critical heuristic firing for a malicious redirector link, pointing to 'https://gettraff.ru/aws?utm_term=ata+chapter+29+pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to a technical book chapter, suggesting a phishing or social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/aws?utm_term=ata+chapter+29+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416322/normal_5fb5e8231bb5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370076/normal_5fc035526e9b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_5fb2ae6aaa50e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407057/normal_5f995b6a78556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_5fa626b04207b.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/5fbce344be7cfc36344e8aaf/t/5fbcf12d3ca23154c95a3c8b/1606218029758/horizon_walker_5e_multiclass.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/atlassian_playbook.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f1725bcb0228a282b335/t/5fd183850f163860c7a743ad/1607566214116/20147337419.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/pebozabizarisirinig.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/wilikatogorages.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/5803424636.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5a6398139af0376657f99/t/5fd6ca895488895576bbb2f8/1607912073914/vuxufisidiwibuxinegexajo.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_off0000d6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E4 5308 bytes
SHA-256: 6d6b3b0317f2bfe9ba6d1bd5944826c9b4465db22b8553d90be8af1e8c8666c9
font_01_sfnt_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 10768 bytes
SHA-256: 710ce164e35a23691fdde5f08c1ad7e5d25c5aa680db9c33bb46c423abf5c5b5

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