Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc48bd81884c7915…

MALICIOUS

PDF

45.9 KB Created: 2020-11-04 05:00:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 48f1fe4e7775a4dfcea3d67545ba3718 SHA-1: 23c628a83db17272ff0bc2c6ef90c89b0f579912 SHA-256: bc48bd81884c7915533940e504758b5dc753c96229945368f73205a93487fbda
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://ggtraff.ru/strik?keyword=parking+at+lowell+train+station In PDF document text
    • https://julasunanuk.weebly.com/uploads/1/3/4/3/134308365/0438942be32f78f.pdfIn PDF document text
    • https://xudaxeja.weebly.com/uploads/1/3/4/3/134339900/toxumixibo.pdfIn PDF document text
    • https://nikokitigo.weebly.com/uploads/1/3/4/5/134500207/4456afaeaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5f98cd70328fe.pdfIn PDF document text
    • https://lurukise.weebly.com/uploads/1/3/4/4/134454795/mumeredin.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/2345465.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/naranofinovujix/dogupazotadalovuk.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/55842495565.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/zijefutobak.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/kovigejira.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/oracin_ala_divina_providencia_da_primero_de_cada_mes.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_off000075fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75FB 5008 bytes
SHA-256: 14222da58374f42495d975c569b47ead28f19d3a84445df9b525f417788df9ea
font_01_sfnt_off0000872b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x872B 10616 bytes
SHA-256: c5e0ac0bfff6acf5d176e01339846bed42e63a06721bda3d5212d9c2d099dcf1

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