Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c7ba1bd5f15a04…

MALICIOUS

PDF

46.6 KB Created: 2020-10-10 13:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7e9645e1bc95794a56806b92126b0215 SHA-1: e7b90bc76759f45c65f1c72f2791b8ddcf9c2290 SHA-256: b7c7ba1bd5f15a047b93e8517a97f89a72652d81f178cfb56df920d66ca5e303
154 Risk Score

Malware Insights

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

The PDF contains numerous links designed to appear as search results, with one prominent link leading to a known malicious redirector. The document body, though partially corrupted, contains text related to 'singer sewing machine parts manual' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of multiple PDF links and a malicious redirector indicates a link farm or SEO poisoning attack.

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://ttraff.link/pify?keyword=singer+sewing+machine+parts+manual In PDF document text
    • http://files.worldwide4travel.com/uploads/1/3/1/4/131452959/557961.pdfIn PDF document text
    • http://sesivux.kingfisher-strategy.com/uploads/1/3/2/3/132302868/9874854.pdfIn PDF document text
    • http://files.gunhillstudios.com/uploads/1/3/1/6/131606739/c3c8bf25ba604a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b29806d8-725c-4456-b1a2-148709aeec94/piwikubunutaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca99b90-2ce3-4995-a1e8-adaf3d294c75/8444830461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637d91b7-87a1-4dc9-a9cb-e50f00d7551e/3050444447.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3029/9292/files/civics_eoc_study_guide_part_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1267/5995/files/suxivoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5760/8864/files/app_backup__restore_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c146982c-8b59-4a95-9f63-3aa22e10b3f7/lukipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b655e94-8c31-4426-a1bb-675216d96fa6/83682198144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13132a19-80a6-4106-82fc-f68c49cc01b8/zabutoxeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f29d2f6-e50c-4e8f-841a-90ff6e9c0c45/xufutokirofirukiz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6934 5316 bytes
SHA-256: e5fc211faa4b685f2945a17c8da3c2c635ee90db98cba12d55aedd0f43b472d9
font_01_sfnt_off00007b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B25 10896 bytes
SHA-256: 58c006696baa885110393da6d9f121dc4ca9ca9589846c2ada75f66320197cdc
font_02_sfnt_off00009fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FA2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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