Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af04829ca96edce…

MALICIOUS

PDF

48.5 KB Created: 2020-07-23 07:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6edb20a5f55049c4f6de386541f89c22 SHA-1: e34a966b3057c5a6eaf50ead6fa2a5e07205a452 SHA-256: 0af04829ca96edce7ecb9e9bb71baeafafaf1764e2061d7f472e58d7f780e971
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, masquerading as search results for 'Apache lucene pdf indexing'. One of these links, 'https://ttraff.cc/wb?keyword=apache%20lucene%20pdf%20indexing', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, preventing a clear understanding of any embedded scripts, but the presence of many external links suggests a link-farming or redirection attack. No specific scripts were extracted or could be confidently interpreted.

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.cc/wb?keyword=apache%20lucene%20pdf%20indexing
    • http://files.ironcovedesign.com/uploads/1/3/2/6/132681587/1928363.pdf
    • http://files.originalpiebar.com/uploads/1/3/1/8/131871902/puwevofilus-xojezaxa-najufoxipugelen-bulefusas.pdf
    • http://files.cphsvirtualmuseum.com/uploads/1/3/2/6/132696113/4705564.pdf
    • http://files.mwprofessionalphotography.com/uploads/1/3/1/1/131163512/limorivasolo-pesefem-buvewovo.pdf
    • http://files.xzibitstudios.com/uploads/1/3/1/3/131379980/2056237.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9163/8934/files/59064890940.pdf
    • https://cdn.shopify.com/s/files/1/0430/3077/3913/files/kiwutesuta.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wizivudid.pdf
    • https://datoniv.files.wordpress.com/2020/07/xinekedaluvadewe.pdf
    • https://wokediwiwoj.files.wordpress.com/2020/06/82540314755.pdf
    • https://zozumak.files.wordpress.com/2020/06/gubewozimowupezekubi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5957/6986/files/kasezemotim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zukukujumifuxutage.pdf
    • https://cdn.shopify.com/s/files/1/0434/2664/4125/files/kafuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4695/files/welodiborenefulovazubajil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0808/9509/files/39759687233.pdf
    • https://cdn.shopify.com/s/files/1/0431/9887/3762/files/vusoxamedipunesep.pdf
    • https://cdn.shopify.com/s/files/1/0432/1630/6344/files/mipufusagogeguzepijusur.pdf
    • https://cdn.shopify.com/s/files/1/0437/3233/6791/files/48318220249.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/63182709874.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008117.bin
d70ad4461172bac6ec8b2bbc08ae6eceb3aa8a529e95aebb4e669d43ca0036f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8117 4892 bytes
font_01_sfnt_off000091b5.bin
0b2e8ccc5683eb5ca831046e3b2d01c536355ca940163563d6a98e6b2b5f5f96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91B5 10312 bytes

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