Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c29edcfee6d935…

MALICIOUS

PDF

40.8 KB Created: 2020-07-12 21:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fe1de53cea28cf5ea92942335a7f60e SHA-1: b4d3d508c32a1baadcd3af2b76ca589d75e32534 SHA-256: 22c29edcfee6d9356116abfe4ebf78059ac6275455a1a1abd226a43971159bf9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The primary attack pattern involves directing users to potentially harmful external sites.

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=rephrasing%20modal%20verbs%20exercises%20pdf
    • http://files.sjuartdesign.com/uploads/1/3/1/6/131606087/wulixakitanajukaf.pdf
    • http://files.happypathmeadows.com/uploads/1/3/1/0/131069887/6a3b13d4415.pdf
    • http://files.culturalenquiry.co.uk/uploads/1/3/1/3/131384735/8b11ccb1bc.pdf
    • http://files.lbjixxerstudio.com/uploads/1/3/0/8/130874352/buder.pdf
    • http://files.deepjyotibiswas.com/uploads/1/3/1/4/131437037/wuvagadunemife.pdf
    • http://files.kdhodges.com/uploads/1/3/2/7/132740321/5360778.pdf
    • http://files.historiapopuli.com/uploads/1/3/2/3/132302910/roresi_sanijawi.pdf
    • http://files.cc-sd.net/uploads/1/3/0/7/130739488/1019519.pdf
    • http://files.deepjyotibiswa
    • https://popuxokogoju.files.wordpress.com/2020/06/62519479397.pdf
    • https://jagawerabuvi.files.wordpress.com/2020/06/tawamadidoguzulikap.pdf
    • https://jigatize.files.wordpress.com/2020/06/41967475159.pdf
    • https://zopoluwo.files.wordpress.com/2020/07/4227361492.pdf
    • https://mexutux727649879.files.wordpress.com/2020/07/guzaja.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7962/files/mudugisogiridinumawujot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18983443830.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/bazeniwalege.pdf
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/93003965477.pdf
    • https://cdn.shopify.com/s/files/1/0435/0600/8216/files/wegutefebasowofelawune.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tevedizulav.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/70334366835.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/benubojebexoreloruva.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/funowobuteb.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061fb.bin
2894105bc6fb523c75ea56d04eca3ef778a8282863c3c26bb2dca7d44345dfc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61FB 5552 bytes
font_01_sfnt_off000074ac.bin
beb52bbf1c2503db3e06305db52037e320cdb1a299a2e1466aaa595765b703c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74AC 9620 bytes

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