Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a3379f333f8792…

MALICIOUS

PDF

69.8 KB Created: 2020-12-23 09:10:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a0aaa7d7b5f82df052a49d19a31138d5 SHA-1: 4d2049ca23df13162384dd652b82f0aa4119495b SHA-256: f1a3379f333f8792a4a9b15a8c5f8abd6c0852c276ad226199e1bb39417b48b7
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link to a known malicious redirector, traffmen.ru, which is indicative of a phishing or malware distribution attempt. The embedded URL heuristic and the critical PDF_MALICIOUS_REDIRECTOR_LINK firing confirm this. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious URL.

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=events+nearby+here+this+weekend In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5f8e8ec765d63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_5fd29c30df8ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459654/normal_5fa46114b8237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_5f8997702b6b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_5f9fe23db1a3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417988/normal_5fa6e8b9f0508.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e294696-55a7-4ab0-ad6a-de578ce92ba3/54890092500.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/woxowazo.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/xivatonegikenanebatosikom.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/84446018808.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/62511087743.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/13628926343.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/classify_and_categorize_worksheets_2nd_grade.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC9 5296 bytes
SHA-256: 663641028e9ba43e49f8129fef809e320932184e6799311acc8f9c4ef8db68e9
font_01_sfnt_off0000ced6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED6 7856 bytes
SHA-256: 41dfc473a294dd269e1ee7307515866961a901f3625386196cc9fceb79c9f549
font_02_sfnt_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 11316 bytes
SHA-256: 727dae43ef35da09ea426a15c06820106647b24793cbb99f2e9587788c18c9ca

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