Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc51544ef8e0e56…

MALICIOUS

PDF

47.2 KB Created: 2020-10-16 08:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5017d99a4ce2dd48caa2d03ad587d71b SHA-1: f00b6e17621f495153b63161683e55af3c9b6788 SHA-256: 3dc51544ef8e0e5608b21e17525bf3fd1e142bc2ca88ac7557a68e248297a303
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, identified as a link farm, with one specifically pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the target URL and other PDF links, suggesting an attempt to drive traffic to malicious sites. No scripts were extracted, but the PDF structure and embedded links strongly indicate a malicious redirection campaign.

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://cctraff.ru/wb?keyword=l In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5f88c7f222364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f86f84237f3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f873d22ebc2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f87f130421c7.pdfIn PDF document text
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/9041530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_5f890b8cab6c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f8773bdbd064.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/154f826c39fded.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/9d01d2.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/zuraj-tegexiduw-limav-parerus.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/8147096.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/8135/5430/files/missguided_free_next_day_delivery_codes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2022/2115/files/surf_city_elementary_school_phone_number.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7472/3233/files/dale_hollow_eagle_facebook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/9989/4175/files/donujep.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_off000075d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75D5 5372 bytes
SHA-256: 28e435da15dad2ed8b9657544a54390ca6c7d76f071f2cd86cc303c877b35f2a
font_01_sfnt_off000087b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87B0 12004 bytes
SHA-256: d1d6a985005ef3c0e0671e699eb72d21055daf78d59278ff7ee0c658d4b1f0cb

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