Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ffecdc84f300f5…

MALICIOUS

PDF

71.7 KB Created: 2021-01-16 22:26:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: cc1cfbd9d0814d226dc75ea1246d7658 SHA-1: 7110deeb3f322a880c547d8274bf631ac6753eda SHA-256: f9ffecdc84f300f55eb82d6ac4ab3481c9bf5d14ed3b6535fd9445c90aab579e
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and Weebly domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/wb?keyword=hole.%20io%20max%20size%20battle%20royale PDF link annotation
    • https://xozipirun.weebly.com/uploads/1/3/5/3/135324749/26b2a5daed3c835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421615/normal_5fe6cd7711564.pdfIn PDF document text
    • https://cdn.sqhk.co/kiwametin/f1heWUQ/red_ball_3_roll_and_jump.pdfIn PDF document text
    • https://zobejonimofov.weebly.com/uploads/1/3/4/3/134354570/72efa53f1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450257/normal_5fae2b5ad9aed.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/jidosatikim/zagekazurewuvufe.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/russian_alphabet_handwriting_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/lifivefokifukogonepukomi.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/53256350062.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/95386366400.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/vulix.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/jatenelojeleluleb.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_off0000dd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD87 5184 bytes
SHA-256: 9fc57ea35713311fbe9ac3794023e33c35d204583a2237a6326d772e96054d37
font_01_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 10296 bytes
SHA-256: 36ea74cfbaaf900f13b820724ba0a99333c44f9e4026638de7731d0fd99dc89e

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