Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efc24d1739390bc…

MALICIOUS

PDF

57.7 KB Created: 2020-11-06 04:23:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: fa79051a9daad53b49a7ccea9fc476f5 SHA-1: b3ce1f1f8bc49ad058fad51d89c361bf4b2db4ac SHA-256: 4efc24d1739390bc1600aaae9de60fd0102b3b72c5e9252f0d856549b197be37
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffset.ru/123?keyword=free+robux+star+codes+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383699/normal_5f9f60f38231a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413566/normal_5fa2322fdf22e.pdfIn PDF document text
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/3857256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384628/normal_5f8d2a9e3829a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450044/normal_5fa3eb70e4419.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/pazuruvegawige-nutakopufe-dawive-nopenosawabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_5f896413cc485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407060/normal_5f9a878075c5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373259/normal_5f894326641a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d56d831b-4e5c-4f15-b5be-eadf8a298e3e/81879312080.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/zafepevir.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000ac67.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAC67 26040 bytes
SHA-256: c4518d94f17f44bd90739cb0fe476e8cf6a9f1dc921f42c1ef649387584ae23f
font_00_sfnt_off000074bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74BC 5336 bytes
SHA-256: 7cf6449dd534c7ff35779a70fefc43571e8a4a8f57a9124785d76a2be861ad49
font_01_sfnt_off000086ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86ED 10948 bytes
SHA-256: dc54457b4ed0174761e5587873a42cfdb770a92f98f09d8f2c758e5b07ef8913

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