Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3b5cff63af74b1…

MALICIOUS

PDF

39.6 KB Created: 2020-11-03 10:48:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: df04d2bee8135819acd373508e7962ce SHA-1: bab0e6326d48823709df4f217dc390c5ef0a0eb3 SHA-256: 1a3b5cff63af74b10e4145a7cc274f56bd48bea38eca615db04e9ecbfde50087
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector URL, indicating an attempt to lure the user to a harmful site. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the embedded link is sufficient evidence of a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/aws?keyword=double+number+line+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406166/normal_5f9efac043d04.pdfIn PDF document text
    • https://falibapop.weebly.com/uploads/1/3/3/9/133997194/ec829a.pdfIn PDF document text
    • https://kobisizosupo.weebly.com/uploads/1/3/4/3/134316778/galixura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383573/normal_5f8d1f9dc76ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_5f8af6676ba06.pdfIn PDF document text
    • https://leputixoted.weebly.com/uploads/1/3/2/6/132683438/povalopoxegum_zufepulopo_dizajutilum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5f9e17a027e2c.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/1/0482/8007/6449/files/full_hd_dual_audio_hollywood_movie_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/0264/7476/files/gas_powered_lawn_edger_menards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc38a81-30b1-429a-8307-007d884b06a4/last_horizon_unblocked_hacked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/1796/5215/files/44241606918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4953e244-6f8d-4929-b0d5-47a2b7110336/sekamikerojozibopibagavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2903eaf8-a855-4709-9bbb-63609054e079/libalixaf.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_off00005dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD8 5012 bytes
SHA-256: 916aa13eaba024d3bce68efb9e3fa0545aa95a0b61d8045a2ae77c60bc19079c
font_01_sfnt_off00006ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECF 10312 bytes
SHA-256: 050bd6a79ef07201a6a0f6c6dded07623a6534a2221fe293f52d4fce01800e41