Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5a1ad9c69778d8…

MALICIOUS

PDF

47.3 KB Created: 2020-10-28 22:38:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 478869cc2e5ab43b46c5b5fcd2ff20df SHA-1: c83ab86f46e7b5540ffad198a59b34a40db35951 SHA-256: de5a1ad9c69778d8cfa6ccc0eceaa528d2d12c60de264b1e0a270e845eaa1a25
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or phishing campaign designed to redirect users to harmful sites.

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://gettraff.ru/aws?keyword=cumberland+falls+state+park+campground
    • https://cdn-cms.f-static.net/uploads/4383572/normal_5f97c99549923.pdf
    • https://wozijasobinela.weebly.com/uploads/1/3/4/4/134445001/4982391.pdf
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f9818e212c30.pdf
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5f8e3743d3668.pdf
    • https://cdn-cms.f-static.net/uploads/4376609/normal_5f8e068175fb5.pdf
    • https://cdn-cms.f-static.net/uploads/4389606/normal_5f93c54f63259.pdf
    • https://cdn-cms.f-static.net/uploads/4377704/normal_5f951409ba840.pdf
    • https://kozezivu.weebly.com/uploads/1/3/4/4/134444222/puxove_sanapelitebanox.pdf
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f87100f2f38a.pdf
    • https://tusemebi.weebly.com/uploads/1/3/4/3/134316443/nuvusobogirita-xefujalerate-nogixop.pdf
    • https://cdn-cms.f-static.net/uploads/4388038/normal_5f95b4c8913a8.pdf
    • https://wunimebi.weebly.com/uploads/1/3/4/3/134361225/cb550.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/94ca8264-3994-4111-8ead-ec9eb6c8a4a7/drill_bit_centering_guide.pdf
    • https://cdn.shopify.com/s/files/1/0502/7486/1250/files/10542781577.pdf
    • https://cdn.shopify.com/s/files/1/0432/8092/4840/files/xujogafobidajejesekewonif.pdf
    • https://uploads.strikinglycdn.com/files/b309b506-20fd-4c82-8dc3-e8214ebd145f/risapesas.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2692/files/abc_physics_book_download.pdf
    • https://uploads.strikinglycdn.com/files/e1304074-e1e2-401d-b82d-5c800e9b2080/76245128776.pdf
    • https://uploads.strikinglycdn.com/files/1a7c13ee-3f2b-4982-abac-71aacb8c90f9/xosefitowatizofulaxovoli.pdf
    • https://cdn.shopify.com/s/files/1/0432/0890/0768/files/1266900988.pdf
    • https://cdn.shopify.com/s/files/1/0266/8947/0643/files/ratios_and_proportions_worksheet_6th_grade.pdf
    • https://uploads.strikinglycdn.com/files/9ba8d825-7376-469c-b2f7-f1ebb4cfa731/44627421743.pdf
    • https://cdn.shopify.com/s/files/1/0481/1721/9481/files/list_to_string_python_join.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_off00007959.bin
c1cf379404265d63708b4214d893edce2301448b67fc9fcf6aee085ca5a3ee49
pdf-font-stream PDF embedded font (sfnt) at offset 0x7959 5584 bytes
font_01_sfnt_off00008c3c.bin
2a6f239bf9829ea8a61fd5176f01776345a734d8eb3ace492ce33c462ad9d719
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C3C 10352 bytes