Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d1949e5f3a9920…

MALICIOUS

PDF

69.6 KB Created: 2020-12-29 23:12:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 418f17d968b1784ebf4b39f0a6abca3c SHA-1: 3e76d64d31b3707144e5ef52f95d3017cad5db3e SHA-256: c3d1949e5f3a992063bb83a906254614935d81aaf97bf3ad33215dc170a6db3f
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains text related to 'amiibo' and 'mario maker', suggesting a lure to attract user clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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.
  • 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=como+usar+amiibo+en+mario+maker+3ds In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5f9a8eb5f0d92.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/ibihgVe/57019819261.pdfIn PDF document text
    • https://cdn.sqhk.co/mevojazix/SNgbH9n/29016365238.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/hbifvjj/69764124696.pdfIn PDF document text
    • https://takotifisusa.weebly.com/uploads/1/3/4/4/134499816/2819703.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/lekelepowo/angular_quickstart_github.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c193d5-960d-42dd-8a43-0f651ee8539f/30143500607.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/que_son_las_reformas_borbonicas_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/30581339429.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/tennessee_whiskey_george_jones.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/tutorial_java_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ae35ce3-3b19-4b7f-958b-623957b82800/xulodebi.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/lofepejikovapanitalanil.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_off0000d324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD324 5212 bytes
SHA-256: 87aeea3895d9cc930bb95677d73d59e15495f69f16f401ee6131c32f1bc4d6e9
font_01_sfnt_off0000e4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 11084 bytes
SHA-256: 4eb183d8c9cf4d335c8a6089f1c045d53243278591ccb117209064954d24027d

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