Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad766daa31255cfd…

MALICIOUS

PDF

41.4 KB Created: 2020-04-04 10:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: a4fdc5b6c1046a201c1234d242daee9b SHA-1: 39c63bceed42cdde152c7cf1cefa92f384e26c5c SHA-256: ad766daa31255cfd0af0664247c677417a99dde2166991f24a4f2c02bbfe75b3
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains a significant number of external links, characteristic of a link farm. The primary purpose appears to be directing users to a collection of other PDF files hosted on various domains. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond link distribution.

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 http://yujiaohong.com/uploads/1/3/0/7/130775520/130775520.html#1+5+psig+to+psia PDF link annotation
    • http://emilysadecki.com/uploads/1/3/0/6/130603822/koxipiteraxa.pdfIn PDF document text
    • http://christine-smithdesign.com/uploads/1/3/0/8/130814466/3d8a17.pdfIn PDF document text
    • http://gramatec.net/uploads/1/3/0/2/130270937/gumofinasufegaf.pdfIn PDF document text
    • http://rorsystems.net/uploads/1/3/0/6/130605426/ad0086d9126712.pdfIn PDF document text
    • http://jkgconsulting.ca/uploads/1/3/0/5/130588484/notigedig-segevigasawem.pdfIn PDF document text
    • http://fireselkiecreations.com/uploads/1/3/0/7/130775983/mupovanesiv-kuruwufoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F33 8404 bytes
SHA-256: 0f44818b3e23e03c4cff920866fcaaa94ca5f7c7a5c9386036f15a84af6ed452
font_01_sfnt_off00008fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FBE 2704 bytes
SHA-256: cf2338b7895a3a873add1db7dfb411390262a2a3d24e5b3dccff59843624ea97

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