Malicious PDF — malware analysis report

Static analysis result for SHA-256 121d138f8aa8188f…

MALICIOUS

PDF

47.6 KB Created: 2020-11-07 05:16:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1eff11f33743ff1f8686a453446303dc SHA-1: 7e292f1e833d7fd10c0db4a0cc36f9289a4e42f7 SHA-256: 121d138f8aa8188f2ec5e7942bf6bca200ee7d75ff8e895da9c8fdb1cb110f4e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains numerous links to external PDFs, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. One of the embedded URLs, 'https://ggtraff.ru/aws?keyword=95+jeep+grand+cherokee+fuse+box+diagram', is flagged as a known malicious redirector. The ML classifier also strongly indicates maliciousness. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to harmful content.

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://ggtraff.ru/aws?keyword=95+jeep+grand+cherokee+fuse+box+diagram In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_5f986a5d0db07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370764/normal_5f89f364ce903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384472/normal_5f9d7221c0a08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_5f94fa34897a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5f88df10b7c16.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/9616268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380084/normal_5f9c1e4de57b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xelinatuki.files.wordpress.com/2020/11/12873235441.pdfIn PDF document text
    • https://botebofeji.files.wordpress.com/2020/11/15963812645.pdfIn PDF document text
    • https://xuwogupiz.files.wordpress.com/2020/11/narul.pdfIn PDF document text
    • https://rarokazuj.files.wordpress.com/2020/11/peruzer.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/vibinofa.pdfIn PDF document text
    • https://jafunavis.files.wordpress.com/2020/11/dejejuxugivife.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_off00007867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7867 6068 bytes
SHA-256: bc8671a64f84146df14ca06b3e0402b967b7b518af7e7e35f248a69e01fa3114
font_01_sfnt_off00008cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF1 10652 bytes
SHA-256: 20f9aec7c8f7665689d54fdeae124737672f9654b8dbafcab08dd9e4091ab433

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