Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cae1e8108b94e08…

MALICIOUS

PDF

50.0 KB Created: 2020-11-03 05:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: beaf523f099da74d3c18da3aa895cf6e SHA-1: 763a39e06139a07e2918c19e0421eb42e851383f SHA-256: 4cae1e8108b94e080238b7d19a919fa5b318bd093b74ffe3336293adb91431b6
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external PDF files, indicating a link farm likely used for SEO poisoning or to redirect users to malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. Although no scripts were extracted, the structure and embedded URLs strongly suggest a malicious intent to redirect users to harmful sites.

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/aws?keyword=myco+nuker+at+amazon In PDF document text
    • https://jazafojof.weebly.com/uploads/1/3/4/3/134310209/8281350.pdfIn PDF document text
    • https://lurukise.weebly.com/uploads/1/3/4/4/134454795/xuvarobop-gegeligirerov-julevi-neset.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/pojododavizufugomi.pdfIn PDF document text
    • https://fozijiruzixusap.weebly.com/uploads/1/3/4/3/134317533/1027297.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/penale/63564624971.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2503/9004/files/1762252326.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/nobovujobag.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/king_corn_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7513/4135/files/curriculum_pacing_guide_miami_dade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/595fec63-3da0-4afb-b44c-e7b2b0682667/22717326908.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/moletovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d2dd22-b74d-4c58-a60f-14101b002c2a/lanotatitaziwapevot.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/rws_air_rifles_at_cabelas.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_off00007730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7730 4788 bytes
SHA-256: eef18604ad650bf5840c6d28dbe6e92276baddf2f96de37a580ef90682267812
font_01_sfnt_off0000876b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x876B 11108 bytes
SHA-256: 9ee46745008a2dcf02587521bf91253f219aea5b6f759580d44e427762d27ede
font_02_sfnt_off0000ad39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD39 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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