Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66b6fcdb483b13e…

MALICIOUS

PDF

68.5 KB Created: 2021-01-01 02:20:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3842fcea9a404b84d622435d6d43abf2 SHA-1: 9421ca8536b2f28bdb0f2722c1b0e60639b7fe08 SHA-256: a66b6fcdb483b13e610ca141fb9257377b1210a396e2f4d95104f63a6ee0814d
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a critical heuristic firing for a PDF redirector link pointing to 'https://cctraff.ru/strik?utm_term=animal+warfare+app', which is a strong indicator of a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to an 'Animal warfare app'. No scripts were extracted, but the presence of a malicious redirector URL is sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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=animal+warfare+app In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383132/normal_5fe6f8e9ad80c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427785/normal_5fee4ba2b5f07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478127/normal_5faf6541d2ce0.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/DRjjhfM/30607213437.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/icHPjbO/best_drum_machine_vst_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413862/normal_5fc4944113755.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesumor/jXgehh6/4122783602.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/ciggihb/jivafalenokaseguvasekavul.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/Un7eDSx/61331995757.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/cgejbsl/kokibumisukovotulif.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/jedaxopopuko/anaconda_python_2._7_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/63809174846.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_off0000d0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B3 4948 bytes
SHA-256: c2eacc7df73ffd465e1e6dae0710a70181f30f9b601d7436939cc766bdb5a2bb
font_01_sfnt_off0000e183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 10592 bytes
SHA-256: c39e060ae04bbb182faed5da1decf4eed508086c34accf60657bc69e668ec8ef

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