Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39f77ee1f8fd58d…

MALICIOUS

PDF

46.9 KB Created: 2020-11-01 19:13:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0eee0543d70968c731b16a8f73c9ae4b SHA-1: 10b8038d961242804daadbb0b916128a4121b43b SHA-256: f39f77ee1f8fd58d2aa07b0e8d003f1c54c5e60df7e497e1ef7f9fcac7455a03
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious infrastructure, indicating an attempt to redirect users to malicious content.

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.cc/123?keyword=dog+front+carrier+pack In 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/1/0507/0985/6435/files/40534726593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/876e8495-a06a-485f-b749-b4cf61d16273/39999273757.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/74409562841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ee440d-3bb2-473f-8c41-987f802f7860/walgreens_south_florida_ave_lakeland.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/jotowuzabumubavevubelefe.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/66404930150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da594b89-7f4e-4049-8219-68da65872e3e/engineering_with_excel_4th_edition_s.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/2076/8186/files/35283372178.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/2702/6079/files/the_meaning_of_science_tim_lewens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3572346e-f9a3-4b35-aa6d-a06cad00335f/48438941850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5396586d-06f2-47aa-be17-cac1ac4fd5f0/gizoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cba2fc1-0c43-4150-9ea1-d06b42e2fdae/italian_denim_brand.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/97846407455.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8630/8018/files/does_newegg_charge_tax_in_ny.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/budapest_tourist_attractions_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4115/9333/files/portfolio_management_business.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_off000079c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79C8 5036 bytes
SHA-256: 63ea54c81e5c5be9cb8964c7d2e674a6f29caf77f1901a116178f3b2df0d6672
font_01_sfnt_off00008b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0D 10692 bytes
SHA-256: 2428e9b09cea5de1b7c1417d29b8003fba8f2496d3d3de42a11158685b6d3340

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