Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88e23cbf09ff1fd…

MALICIOUS

PDF

74.1 KB Created: 2020-11-09 17:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 83ff5d472eae393b61387efd7f37b536 SHA-1: 6b08414ca77cf2e41c0dc35e1d2c7507215969dc SHA-256: c88e23cbf09ff1fd4fc9380f1be6b9a8eea72b4c830322f2bf6da643e9ac31a5
214 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific URL designed to appear as a 'Tetris app download', which is a common lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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?keyword=tetris+app+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412413/normal_5fa935ce38ecc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413564/normal_5f983f6e9f2bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5f8b9cff11c44.pdfIn PDF document text
    • https://kujavubudiza.weebly.com/uploads/1/3/4/4/134497056/safajazele.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/tazesib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/72220974141.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/23851310410.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/magical_metals_dnd.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/96467575140.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB02 4780 bytes
SHA-256: f81780d564db368fc01dab81bf017c784a21e1cbf38f4f3358133a8a60572a0b
font_01_sfnt_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 10264 bytes
SHA-256: 2351718e3fbf7cebc540a12a2276e301875e7844dd4a54194cf403bc9e7b6e51
font_02_sfnt_off00010e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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