Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d24a7b62ac99673…

MALICIOUS

PDF

78.8 KB Created: 2021-01-15 16:06:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 13e59bb7e4cb48ade1a0776b86badda6 SHA-1: ef17b02cd2afcf1caaccfe3279345298cc2a4fc8 SHA-256: 9d24a7b62ac9967370cafb8cac8a3566468ca0c2aa7f2f311dced659d3c4b3a4
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with multiple heuristics flagging it as a malicious redirector and part of a link farm. The primary malicious URL identified is https://cctraff.ru/aws?utm_term=guajira+en+f+sheet+music, which is likely used to redirect users to further malicious content or phishing pages. The presence of numerous Weebly and f-static.net links suggests an attempt to obscure the true destination or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=guajira+en+f+sheet+music In PDF document text
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/30de42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426953/normal_5fa738bb42b79.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/8995262.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5f874727b963c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402737/normal_60007f0c85766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5fd637b558559.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366351/normal_5fcbdaf83bc4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_5f8f57315dfe8.pdfIn PDF document text
    • https://guxizipib.weebly.com/uploads/1/3/4/3/134367178/342e4d2356.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/vexeliku/template_decline_job_offer.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/coriorretinopatia_serosa_central.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/68507797215.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/ata_guidelines_differentiated_thyroid_cancer_2015.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_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 4968 bytes
SHA-256: 58c150545167246ca36abf44e234a2605ac0aa00143eb92556ed272940e322aa
font_01_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 13420 bytes
SHA-256: 3e3683f148a7aec89012a7a7d1db1ee7c12c7b0d4f0d3a9d08dd9a406b797c2b
font_02_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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