Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d2186bbd33b49c…

MALICIOUS

PDF

42.5 KB Created: 2020-07-09 21:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 277fe11c8a5077ba7b6b7029bfb25327 SHA-1: cd007477e550473cff076686dca4ad747c762245 SHA-256: 67d2186bbd33b49c574025cabd7059949a7ef416f0a3b9a2ea3bcf1056877a9d
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the nature of the embedded links suggests an intent to redirect users to potentially malicious content or for SEO manipulation. The ML classifier strongly flagged this PDF as malicious.

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.com/wb?keyword=the%20miracle%20worker%20play%20script%20pdf In PDF document text
    • http://files.poehaku.com/uploads/1/3/1/6/131607239/ab7f23f.pdfIn PDF document text
    • http://files.countrysideanimalclinictooele.com/uploads/1/3/1/3/131380868/newufutuje.pdfIn PDF document text
    • http://files.hpcctimex.com/uploads/1/3/0/8/130873830/78174747e.pdfIn PDF document text
    • http://files.zeroinfections.org/uploads/1/3/0/7/130739120/zoxuxokek-naxazuxazo-rukemisi.pdfIn PDF document text
    • http://files.updatescentral.com/uploads/1/3/1/3/131384018/fotimiva_nidanu_gibuvidedavade.pdfIn PDF document text
    • http://files.blmslibrary.org/uploads/1/3/1/6/131606644/ebdfe5.pdfIn PDF document text
    • http://files.hoolahoopgreetings.com/uploads/1/3/0/7/130775633/a8c5b0689d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://filozurebi.files.wordpress.com/2020/07/fijepakukuvo.pdfIn PDF document text
    • https://verokizafiwi209368049.files.wordpress.com/2020/06/nujabiziwusedupatediseja.pdfIn PDF document text
    • https://nafokajit.files.wordpress.com/2020/07/2084245358.pdfIn PDF document text
    • https://dufamisiril.files.wordpress.com/2020/07/kenegowiwopupisexokirob.pdfIn PDF document text
    • https://ratekoxon.files.wordpress.com/2020/07/supalodowososaxiz.pdfIn PDF document text
    • https://pitimonuzoxa.files.wordpress.com/2020/06/musaxibatedusitejovota.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34707652888.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wurawosupamajo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gejazopemovaro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76588695657.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26443777516.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zafitizeruzu.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_off00006774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6774 5284 bytes
SHA-256: 43a772c3232675951984232cfc9545cab2511edf649d2e09a5e35f12c48216e2
font_01_sfnt_off0000797b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x797B 10360 bytes
SHA-256: 2c4b51bd6cf7c1167735d69b14d85b974b2c338f5cab76e4b8fd80bb17de37dd

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