Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf913aee8a27b17…

MALICIOUS

PDF

66.8 KB Created: 2020-11-23 02:54:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d7f9ea3d4ac1dfed813318ce89dfae4 SHA-1: 5b59edd734691dd692ddf7d5f474436a70883f78 SHA-256: 2cf913aee8a27b175ba6f745e2d18459970b445d17b232cadba2f10ea7c381e2
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link and a link farm, indicating a phishing or SEO manipulation attempt. The embedded URLs, particularly 'https://cctraff.ru/123?utm_term=basic+poison+5e+cost', are flagged as malicious. While no scripts were extracted, the structure and embedded links strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=basic+poison+5e+cost
    • https://sexozorojupur.weebly.com/uploads/1/3/4/3/134390270/jikejedazujuse.pdf
    • https://cdn-cms.f-static.net/uploads/4454424/normal_5fa23e9a77936.pdf
    • https://cdn-cms.f-static.net/uploads/4452193/normal_5fa0bbe8331ca.pdf
    • https://cdn-cms.f-static.net/uploads/4380392/normal_5f9a1dd55725a.pdf
    • https://cdn-cms.f-static.net/uploads/4380522/normal_5fa8738de0ac1.pdf
    • https://cdn-cms.f-static.net/uploads/4479933/normal_5fb2c776861e6.pdf
    • https://cdn-cms.f-static.net/uploads/4373516/normal_5f8dbed43f595.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dibedamoka/123_movies_madea.pdf
    • https://uploads.strikinglycdn.com/files/38a9aa4a-3481-41e6-8cf1-6713abb68321/asia_political_map.pdf
    • https://uploads.strikinglycdn.com/files/b93de1de-9c51-45b8-a10d-09ac9e34564b/alto_saxophone_finger_chart_app.pdf
    • https://s3.amazonaws.com/xeponodij/skam_belgium_cast.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf5.bin
10b361fc3b564a800f9eefca9c66022edda12214ecc7383d949115f44bea8b78
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF5 4972 bytes
font_01_sfnt_off0000dbf7.bin
9d245175f0101a00b637d3fcc6f6810c922b1c134a2430f80e307c49c7eb45e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF7 10176 bytes