Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16ffe88c28a962e…

MALICIOUS

PDF

74.0 KB Created: 2020-12-27 07:14:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ed7b6dfd763d5ec289509c52b7963f1 SHA-1: 025389d0ea95b0e7669b05053c3f307567ce5229 SHA-256: a16ffe88c28a962e0f2acf1b52a67732dc74b51315e3e128f38f9a8023dd5bc4
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://cctraff.ru/strik?utm_term=fist+of+the+north+star+anime+movie+online'. This suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution. The presence of numerous S3 bucket links, some flagged as benign and others unknown, further supports the link farm characteristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=fist+of+the+north+star+anime+movie+online
    • https://guserokofetaw.weebly.com/uploads/1/3/4/3/134341966/2390171.pdf
    • https://cdn-cms.f-static.net/uploads/4366348/normal_5fda04c2bfdd8.pdf
    • https://cdn-cms.f-static.net/uploads/4393369/normal_5f923c73235b0.pdf
    • https://cdn-cms.f-static.net/uploads/4417023/normal_5f99ccf4e40f4.pdf
    • https://wuvekodufunat.weebly.com/uploads/1/3/5/2/135298648/013c2c3ef.pdf
    • https://kirewigofe.weebly.com/uploads/1/3/4/3/134382955/3164019.pdf
    • https://litoxixolemor.weebly.com/uploads/1/3/4/3/134379235/e0afcc3b50e7ffd.pdf
    • https://roxilegetewus.weebly.com/uploads/1/3/4/7/134721251/123879.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wizitifowubux/oxford_first_picture_dictionary.pdf
    • https://s3.amazonaws.com/zidosozawok/african_reporter_rdp_houses_for_sale.pdf
    • https://s3.amazonaws.com/jivagajamav/24880558680.pdf
    • https://s3.amazonaws.com/jofunozuzof/60653084039.pdf
    • https://s3.amazonaws.com/xuzed/2757266114.pdf
    • https://s3.amazonaws.com/wurivuve/chloride_charger_manual.pdf
    • https://s3.amazonaws.com/jusuberu/biomedical_nonprofit_crossword_clue.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_off0000e459.bin
ba0d89fda9c38f71097ecde79ae4a16fdfe64920c868187442c2b9114f1fa772		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 5024 bytes
font_01_sfnt_off0000f54c.bin
f7df6a922fdf2a08294b92edf41d35e1bacfc095f35828921560e7bc8f68faa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 11000 bytes

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