Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e9bbfc0042c684…

MALICIOUS

PDF

90.8 KB Created: 2021-02-13 03:08:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1ce6357ef614024c298b33a7198a4952 SHA-1: 699ea27ad0607b6cf507feaaa1e65a3b09eb8132 SHA-256: f3e9bbfc0042c6841b5aae6409edf6b196d52e65e4b2e36ad8ef21baf704c469
214 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external PDF files, suggesting a link farm or redirection strategy. One critical heuristic identified a link to a known malicious redirector infrastructure, specifically `https://yafferge.ru/wix?keyword=descargar+piano+tiles+1+apk`, which is presented as a download for 'piano tiles 1 apk'. This indicates a phishing or social engineering attempt to trick users into downloading potentially harmful content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://yafferge.ru/wix?keyword=descargar+piano+tiles+1+apk In PDF document text
    • https://static.s123-cdn-static.com/uploads/4391896/normal_5fcb1f854c94a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444114/normal_601b26caef00c.pdfIn PDF document text
    • https://nirereki.weebly.com/uploads/1/3/1/4/131483126/944d308032e03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_6010c511cb321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417830/normal_60230fb67abcb.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/magakabolonexut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420764/normal_6008a156c48fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366325/normal_5fef98f8e7334.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/kuxegu/wivisoj.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/c_programming_language_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/tobolekamoxidexezijezama.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/ledudalusivavizaxulunidu.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/geog._1_workbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/kuruliri.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/97716145786.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 5216 bytes
SHA-256: 0b948f7a88607ea7a70a44e120cf9ec50c0a25634eacf1b42a54cfacee57806a
font_01_sfnt_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 2216 bytes
SHA-256: c3516911a7b31728e6a09acd0b89bb2503c10e4e640faa685fa357e20998942e
font_02_sfnt_off00011934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 11112 bytes
SHA-256: 995baf50cd696ef9160981cb2c7ebd052e7138e5414ec24a69212d32b8b3a263
font_03_sfnt_off00013f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F68 16704 bytes
SHA-256: d6d825ef877a936abc649838a4784b1787e9f6a337485a9e21487f816168744d
font_04_sfnt_off0001558c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1558C 1736 bytes
SHA-256: 1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19

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