Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3dc5111ed8c5b3…

MALICIOUS

PDF

42.8 KB Created: 2020-07-08 16:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 5415402d73b72196bc36071d9a176941 SHA-1: e0e9a9f345e12cdc892ab6952ee28efa47ed9b83 SHA-256: 3e3dc5111ed8c5b304cf63829e6bc0682909cd8b529a186ff36220b1c8186524
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, masquerading as a 'Conners 3 parent response booklet pdf'. These links are designed to redirect users to malicious sites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF_SEO_LINK_FARM heuristic further suggests a deliberate attempt to create a link farm for SEO manipulation or to distribute malicious content. The primary IOC is the initial redirector URL.

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.ru/wb?keyword=conners%203%20parent%20response%20booklet%20pdf In PDF document text
    • http://files.toymigos.com/uploads/1/3/2/8/132814239/1893663.pdfIn PDF document text
    • http://files.bishopgumbleton.com/uploads/1/3/1/3/131379371/tokasinipegog.pdfIn PDF document text
    • http://files.mindscapegallerystl.com/uploads/1/3/2/6/132683111/1329c.pdfIn PDF document text
    • http://files.beechfieldumcbalt.org/uploads/1/3/1/3/131398281/tinerovi_jokituso_potuvisojekow_tariwa.pdfIn PDF document text
    • http://files.oace.co/uploads/1/3/1/3/131381781/parotakime.pdfIn PDF document text
    • http://files.schec.net/uploads/1/3/1/8/131871894/6851944.pdfIn PDF document text
    • http://files.creativecounselingsrq.org/uploads/1/3/2/7/132710787/5366484.pdfIn PDF document text
    • http://files.littleladyo.com/uploads/1/3/0/9/130969004/furopigolijur.pdfIn PDF document text
    • http://files.connallyband.com/uploads/1/3/1/8/131856381/koguwoxixude.pdfIn PDF document text
    • http://files.drnicoledinezza.com/uploads/1/3/1/3/131380953/voxab_kajopuxudol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://divasojawi.files.wordpress.com/2020/06/zuluwifomep.pdfIn PDF document text
    • https://nedidama.files.wordpress.com/2020/07/bibojebevem.pdfIn PDF document text
    • https://wekusov.files.wordpress.com/2020/06/judajudumerawosanuxuwet.pdfIn PDF document text
    • https://ratesovepur.files.wordpress.com/2020/06/gifolejelenorure.pdfIn PDF document text
    • https://nafeneda.files.wordpress.com/2020/06/71489544363.pdfIn PDF document text
    • https://sixupijemiw.files.wordpress.com/2020/06/xekasisi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57790570823.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mofofuledezenededur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57148414383.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexidemunuviviradepinitim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12509012650.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_off000068cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68CF 5164 bytes
SHA-256: 7c611ba49219207a04f13476c3de2904d4d99063fc0f56807fb27b3776f3fc10
font_01_sfnt_off00007a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A59 10408 bytes
SHA-256: 8807e42a79a4395cd55d3f51fc14bd17f9467549b4d9a829a278eea36fe8e168