Malicious PDF — malware analysis report

Static analysis result for SHA-256 661b3ade1e282e4f…

MALICIOUS

PDF

77.5 KB Created: 2021-01-20 07:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 78ec92ea8c838aaf130d28695e1303b1 SHA-1: ec1a4d5e79d741da5cc593fe79380520eb831862 SHA-256: 661b3ade1e282e4f4db01204cdd9c24a2ecece273815c0af5b05c3c29130a9cd
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/123?utm_term=isaac+newton+y+sus+leyes'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL within the document body strongly suggests an attempt to lure the user to a compromised site, characteristic of phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/123?utm_term=isaac+newton+y+sus+leyes In PDF document text
    • https://site-1179300.mozfiles.com/files/1179300/5434974720.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378149/normal_5ff5b5d5d7060.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389361/normal_5f8e060cbf705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464865/normal_5fd66f33d1294.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465908/normal_5fffea5b5104f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471081/normal_5fc44340285a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413363/normal_5fee82608d6f4.pdfIn PDF document text
    • https://site-1172895.mozfiles.com/files/1172895/93676426872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391899/normal_5f911f120a94d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415974/normal_5fba4a1164081.pdfIn PDF document text
    • https://site-1247884.mozfiles.com/files/1247884/nesemobofobaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_5fe670fb67239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369494/normal_5f8c90053b08d.pdfIn PDF document text
    • https://site-1167978.mozfiles.com/files/1167978/childrens_beds_with_slides_ebay.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368245/normal_5fe2b23e402e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_5f8f40bfbdc09.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
    • 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_off0000e2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E9 4664 bytes
SHA-256: d843e0bb8bb31da27b4d6296fa79b8605346322d76d242dce3c4beff34420492
font_01_sfnt_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 12128 bytes
SHA-256: 768d8959ecd13901481a6d816077b7e27e3ce2b11d15bbcf785e6fdbd3f32f5d
font_02_sfnt_off0001199a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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