Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfe0234a4f93815…

MALICIOUS

PDF

41.5 KB Created: 2020-07-10 15:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 94356298f83b71d6a03aa7ddecb12891 SHA-1: e438de247cf84c7f4b8ae40ecb0849fbe91fe721 SHA-256: fcfe0234a4f93815df1bbef5ad75570b8396d42b818d86adcd86190c74417163
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF document contains a mass external link farm, with numerous links pointing to various PDF files hosted on different domains. One prominent link redirects to 'https://ttraff.cc/wb?keyword=nonsense%20words%20context%20clues%20worksheet', which is identified as a malicious redirector. The document body, though containing garbled text, also includes this redirector URL. The presence of a large number of external links, including a malicious redirector, strongly suggests a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=nonsense%20words%20context%20clues%20worksheet In PDF document text
    • http://files.cchsny.org/uploads/1/3/1/6/131606947/9934822.pdfIn PDF document text
    • http://files.camppepper.com/uploads/1/3/2/3/132302913/1217584.pdfIn PDF document text
    • http://files.woodyshticks.com/uploads/1/3/1/3/131379612/ritozo_luwubuvilul_bizifodoli.pdfIn PDF document text
    • http://files.heavygrail.net/uploads/1/3/1/3/131380733/bitat.pdfIn PDF document text
    • http://files.madeintheglades.com/uploads/1/3/2/8/132815004/9786959.pdfIn PDF document text
    • http://files.mmrcdsguerra.com/uploads/1/3/1/4/131410485/gibedozekadokifu.pdfIn PDF document text
    • http://files.northcountyhumanresources.com/uploads/1/3/1/4/131438571/3038182.pdfIn PDF document text
    • http://files.d-aleksandar.com/uploads/1/3/0/8/130813546/gakujatufaxa.pdfIn PDF document text
    • http://files.rioxpvista.com/uploads/1/3/1/6/131637034/36c763c9765.pdfIn PDF document text
    • http://files.quantumbasscenter.com/uploads/1/3/1/3/131398447/sodeve_tidilobe_tebogukazixe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fulafemep.files.wordpress.com/2020/06/43272369881.pdfIn PDF document text
    • https://wuxegura685470280.files.wordpress.com/2020/06/56800633394.pdfIn PDF document text
    • https://vitosomuzete.files.wordpress.com/2020/06/72791906620.pdfIn PDF document text
    • https://lotopakaxil.files.wordpress.com/2020/07/71110326484.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92588710477.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/bopagus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/womosoravitixugefiwil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32878299647.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66A7 4844 bytes
SHA-256: d9fe5e1563b2b5daa5d3fabacf01024b801e9a5de509d66efa4e86fef9bfdb14
font_01_sfnt_off0000772e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x772E 9940 bytes
SHA-256: 21fe4d18dd099f210a53af54921e2d6c779a43527bc39b66842a27abb03014dc