Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd0dc8381e7ce51…

MALICIOUS

PDF

46.7 KB Created: 2020-09-12 04:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 900f4b89ab41a93fca56d3beb66b1817 SHA-1: b0834e3fe0a97d4b79a19fcf5ff4b3a83e58b37d SHA-256: 7dd0dc8381e7ce51ba52bdbfe5cb42b084a74663c7231726c50511add54128ca
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting and are likely part of a link farm. One of the URLs, 'https://ttraff.me/wix?keyword=atividades+de+alfabetiza%25C3%25A7%25C3%25A3o+em+pdf+para+imprimir', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be to lure users to malicious infrastructure.

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.me/wix?keyword=atividades+de+alfabetiza%25C3%25A7%25C3%25A3o+em+pdf+para+imprimir In PDF document text
    • http://files.junjianwang.com/uploads/1/3/1/8/131871424/domexujude.pdfIn PDF document text
    • http://gezewotor.franktownunitedmethodist.org/uploads/1/3/2/7/132741073/b9c4054f3.pdfIn PDF document text
    • http://files.designandsave.com/uploads/1/3/2/8/132814050/wavadiwumup.pdfIn PDF document text
    • http://meteri.callerniehatton.com/uploads/1/3/1/3/131379530/vikurepiwixivemewoge.pdfIn PDF document text
    • http://files.alexsarrigeorgiou.com/uploads/1/3/1/4/131411199/9036105.pdfIn PDF document text
    • http://sijajuge.wpyouthcenter.org/uploads/1/3/0/8/130814328/jabejo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b9801a_846793b6e727432d9e54e761b95d2a48.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/38955b_f6fcd9ad0cf64407b4e7c27d5e6e9a05.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/70e5f7_d17b957de708419ba5f311668122674d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_053c0258328d466fb7a69ceb52b4bdd0.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0958/8897/files/91392441247.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6259/9585/files/25686143618.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/setixinojed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6735/9900/files/behavior_modification_chart_template.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000715d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x715D 5924 bytes
SHA-256: f4294429e1809f809735293a709f8fe439fb5946097898fcdb5e39371e1e2289
font_01_sfnt_off000084ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84EA 12704 bytes
SHA-256: f735a144a323a45fdd64064801b5fe2e3b678c6ea4194865828258a0a1ad8dcc

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