Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fab6a3ca20533b…

MALICIOUS

PDF

44.3 KB Created: 2020-10-28 17:08:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 44c2bfc89a009210203bd536941c27ee SHA-1: d4e23a5ed519c9c93bdb2944734d412c87a5e331 SHA-256: 83fab6a3ca20533b1cc6b95cf8047e0e7237c32c7cd84b9d1b0c0620e5d35853
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://cctraff.ru/strik?keyword=sticky+ninja+missions+game In PDF document text
    • https://rulomegujenuguv.weebly.com/uploads/1/3/4/3/134329868/9ccc44.pdfIn PDF document text
    • https://vapesokon.weebly.com/uploads/1/3/4/3/134329795/2679997.pdfIn PDF document text
    • https://juliraviwuziw.weebly.com/uploads/1/3/4/2/134267057/vukonabijisaku-gitito-bonixuti-julifagadojif.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/sigerufubo.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/degiduxuxut_jofabamukok.pdfIn PDF document text
    • https://janunawavi.weebly.com/uploads/1/3/4/3/134314220/tabedib.pdfIn PDF document text
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/7480355.pdfIn PDF document text
    • https://riwuwodanujebu.weebly.com/uploads/1/3/4/2/134234990/16d9bfd5.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/3c30e9ffd729.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/mijedusovineti/wonder_book_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/niwexoxopolab.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/98744862147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52614ee3-5e8d-47bf-b9d0-df96c83c79ec/5446780397.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/nonolux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/290b0771-4828-4b55-baf5-4877f1af6957/tribunal_de_la_acordada.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/binomial_series_expansion_formula.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/marungko_approach_reading_materials_tagalog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8155fc76-96c7-4e03-a652-152b224b3d08/dijifuxujef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33ed2b70-8dec-4049-a13f-5a3255953122/91353521280.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000568b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x568B 5336 bytes
SHA-256: 7976ee228a165ec9825399230758ce2e483b643a73edde9ff477231198132413
font_01_sfnt_off000068be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68BE 10988 bytes
SHA-256: 1edd3926a9cc91a42d611770a5cbc7c6dc9585b6fe0d63d2de575314405e30e2
font_02_sfnt_off00008e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0F 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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