Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe925040a723969…

MALICIOUS

PDF

72.2 KB Created: 2020-11-02 21:48:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f2b16e1fdc5dc1e95e305698f16853d SHA-1: 1c49cd189a228641ef663b92cf23eac1121ec878 SHA-256: 9fe925040a7239698eef3589358994a444eeec57f216899077f8aaf9f9a55e86
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute content from various sources. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/strik?keyword=turpentine+and+sugar+home+remedy
    • https://cdn-cms.f-static.net/uploads/4378618/normal_5f918c8d72393.pdf
    • https://cdn-cms.f-static.net/uploads/4386363/normal_5f8ca6506ddc6.pdf
    • https://cdn-cms.f-static.net/uploads/4372985/normal_5f8a026b4fce4.pdf
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/golikotematazerir.pdf
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/81ca275.pdf
    • https://dipakinujudisil.weebly.com/uploads/1/3/4/4/134468351/bizamuvozuba_memuravixez.pdf
    • https://tefimapotile.weebly.com/uploads/1/3/4/3/134351392/6167451.pdf
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/40e41c0e0b91.pdf
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/gowijipomunolu_lirogub_loletakimup_rozugofekowe.pdf
    • https://cdn-cms.f-static.net/uploads/4392660/normal_5f9719d75c042.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/abba6b97-bde1-431b-9bec-4f71e81b8a17/jenujegodideriguduge.pdf
    • https://s3.amazonaws.com/leguvefu/definition_of_integration_in_calculus.pdf
    • https://uploads.strikinglycdn.com/files/e886b614-44b4-44a9-8ec2-f5b04d1a3626/larimozak.pdf
    • https://uploads.strikinglycdn.com/files/0036d208-d08c-4458-baae-995b9bdf4b70/catalogo_de_cuentas_sat.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d955.bin
188bde19d4d82f008e90467fcac2ee7827608bf3399b21e1fb472ebf1c2cecd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 5392 bytes
font_01_sfnt_off0000eb89.bin
f1ba68f30347ead2ddfab955a7689b35fc76c50aca5a6bf09c74065864bd649c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB89 12192 bytes