Malicious PDF — malware analysis report

Static analysis result for SHA-256 17cfbd8d6ed82941…

MALICIOUS

PDF

70.0 KB Created: 2021-01-01 07:32:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 20220e3c86453279b3b3425367aad9e2 SHA-1: 4808d6219f50dfc04b1f8806599f77bbe63ff32c SHA-256: 17cfbd8d6ed82941d160ba0905156235c4e61d6384d96903624d0c8a17679a87
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a malicious redirector link disguised with text about playing tennis. The link leads to 'https://cctraff.ru/strik', which is flagged as malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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=play+tennis+inside+near+me In PDF document text
    • https://cdn.sqhk.co/liregevo/iijjPhf/loop_yarn_blanket_pattern_criss_cross.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404983/normal_5fbc66d251114.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462096/normal_5fe3dedd2cdaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385614/normal_5f8d083a3afa5.pdfIn PDF document text
    • https://cdn.sqhk.co/sawapevodef/ja1P0Rr/52534037588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380867/normal_5fc0c039ec011.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/g9Pifjd/pezasab.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/ichif1V/final_fantasy_iii_snes_world_map.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/fjaighj/corneal_cross_linking_recovery_time.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388165/normal_5fa09ac4909d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368762/normal_5f88f546954ba.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/kelukakeb/nezisojotodep.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_off0000d716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD716 5072 bytes
SHA-256: 3696ec9a7b0af0e1069295c35fafe1729a23667ee70d4fa1a0ead7d7b2611e56
font_01_sfnt_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 10348 bytes
SHA-256: 4e8849484a1ba2615c6ba76ec3784f9d5327a10e95a1c06810cee07eb0c6bed2

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