Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c6afaab41f9d1b…

MALICIOUS

PDF

37.8 KB Created: 2020-10-31 02:14:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c111dc61775d102876935127fc3b9e57 SHA-1: 9802ddb64fcd6b44b0eca11aeb19e4def0418462 SHA-256: 33c6afaab41f9d1bcb6e1c2a70eed7f7e46bdc00213abacf08424c71b7c22c8e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting it's intended to lure the user to this malicious site. The ML classifier also flagged the PDF as malicious with high confidence.

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://ttraff.cc/123?keyword=printable+dbt+worksheets+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_5f9b429a25aa6.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/5954599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392871/normal_5f8f89037d276.pdfIn PDF document text
    • https://getedizexagan.weebly.com/uploads/1/3/0/7/130740146/zeruxodemezad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416918/normal_5f951bcd3b18f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417329/normal_5f9a038bc6c1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_5f96e308c84dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_5f910f0ec9adf.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/1/0500/4037/3398/files/megabox_apk_for_android_tv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9883/1527/files/respawnables_6.8.0_apk_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/924f6668-0769-4b6f-86bf-686d1009ec8d/jifolumububa.pdfIn PDF document text
    • https://s3.amazonaws.com/digigitusuduk/diamond_painting_tools_walmart.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_off0000548b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x548B 5424 bytes
SHA-256: 497129e15c49fff036afb16107b1442b8417f0eb8d3354a0e1c24d35ddbee9fe
font_01_sfnt_off000066fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66FE 10416 bytes
SHA-256: f1d0ea5c64fdb34ab1a7c6ba6d063633ec2230e77afd603b93d5d2970316d35b