Malicious PDF — malware analysis report

Static analysis result for SHA-256 761e414996db5bbe…

MALICIOUS

PDF

44.3 KB Created: 2020-08-11 16:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef2a18e5348a12a8dc89b69a2e2dc71c SHA-1: e2e9428a1663615cf4b3d42c2bc7ca750a38c9ab SHA-256: 761e414996db5bbec17b12d4fd8b4373278b7403a1b94ede63cf16ed398cc779
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure or are part of a link farm designed to manipulate search engine results. The primary malicious URL identified is https://ttraff.ru/wb?keyword=instruction%20set%20in%208085%20microprocessor%20pdf, which is flagged as a redirector. The document body, though heavily obfuscated, contains references to academic topics, likely as a lure to encourage users to click the embedded links.

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://ttraff.ru/wb?keyword=instruction%20set%20in%208085%20microprocessor%20pdf
    • http://files.fccvideo.org/uploads/1/3/1/6/131606552/pajanexixuwe-rasenitilujutox.pdf
    • http://files.thestudiosouthtampa.com/uploads/1/3/1/3/131380618/dorubelaxufit-zaseb-zozuto.pdf
    • http://files.aatgwa.com/uploads/1/3/1/4/131483083/mejat.pdf
    • http://welakob.karenskreativekorner.com/uploads/1/3/2/3/132302782/724881.pdf
    • http://files.lockmangenetics.com/uploads/1/3/0/7/130775383/nizejab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/4614/1093/files/47613255453.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5941/files/84860532831.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66689816557.pdf
    • https://cdn.shopify.com/s/files/1/0430/9647/3749/files/arraybuffer_to_blob.pdf
    • https://cdn.shopify.com/s/files/1/0436/9406/3770/files/11915526085.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49839171509.pdf
    • https://cdn.shopify.com/s/files/1/0432/1987/8048/files/74938067326.pdf
    • https://cdn.shopify.com/s/files/1/0431/8560/2721/files/mufutexovetabisepus.pdf
    • https://cdn.shopify.com/s/files/1/0434/8136/6693/files/nosesu.pdf
    • https://cdn.shopify.com/s/files/1/0449/3040/0411/files/fedora_install_chrome.pdf
    • https://cdn.shopify.com/s/files/1/0437/8230/7989/files/dukokilakopapeme.pdf
    • https://cdn.shopify.com/s/files/1/0431/2281/9233/files/28896000674.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35209966956.pdf
    • https://cdn.shopify.com/s/files/1/0432/6578/6006/files/9179134721.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006015.bin
5dcce77ac63327a18232edde6a51714fc61e6d3811077465f9043c2f1fac9954		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6015 5336 bytes
font_01_sfnt_off0000721f.bin
764a21c54f1885eec7bfa0d9aef392f36f4328d24eb79cc9536d6fffe8de2a74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x721F 10456 bytes
font_02_sfnt_off000095d1.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95D1 4324 bytes

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