Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc346136b0f5e76b…

MALICIOUS

PDF

89.2 KB Created: 2021-01-14 04:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bea30adc52bb31c62ac1d09d9c80223b SHA-1: 093f3513a5e533539182d8ea4759fba2e0f90acf SHA-256: cc346136b0f5e76ba3de085b13bae9398e7f5c2943ff5693f6f9027e2a7d3c51
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector pointing to 'https://gettraff.ru/aws?utm_term=mandatory+reporting+tasmania+education'. Heuristics indicate the PDF is a link farm on disposable hosting, designed to redirect users to malicious infrastructure. The ML classifier and ClamAV detection strongly support a malicious classification.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/aws?utm_term=mandatory+reporting+tasmania+education In PDF document text
    • https://site-1192771.mozfiles.com/files/1192771/vejironakolekeraputijuf.pdfIn PDF document text
    • https://site-1171454.mozfiles.com/files/1171454/temple_run_game_app_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/liregagibago/hijhbhh/heart_problems_in_men.pdfIn PDF document text
    • https://site-1172777.mozfiles.com/files/1172777/audio_medical_books_free_s.pdfIn PDF document text
    • https://site-1174988.mozfiles.com/files/1174988/lebefagakovoxopatu.pdfIn PDF document text
    • https://site-1168077.mozfiles.com/files/1168077/nickelodeon_slimefest_2020_postponed.pdfIn PDF document text
    • https://site-1168253.mozfiles.com/files/1168253/wozejebikeziwutarivega.pdfIn PDF document text
    • https://site-1193774.mozfiles.com/files/1193774/xuvomunedenemebugiga.pdfIn PDF document text
    • https://site-1174404.mozfiles.com/files/1174404/33203358044.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/zesixefe/cv_template_2019_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/btw_indirapuram_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/zopotojunusegi.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_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 5468 bytes
SHA-256: 5c73bacca5b935286fe941fa20d1a5f5f501cb225d36e4ac30027760b8755be3
font_01_sfnt_off000133a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A9 10672 bytes
SHA-256: f4013b07f80962855f744220ea99d3a8385e6cac7a16c1da0d794ab2992ad08a

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