Malicious PDF — malware analysis report

Static analysis result for SHA-256 5909f1084beb7a60…

MALICIOUS

PDF

48.5 KB Created: 2020-11-04 09:47:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 91dc01d6ecaa5b62b7a31d8f815a8faa SHA-1: da111fb9fe98222749d0d149566d88bf9aad1b3f SHA-256: 5909f1084beb7a609be55aa6de92e365913bb6c3fe873b930bbf1009a9ee222c
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://cctraff.ru/strik?keyword=free+xbox+live+gold+trial+code+2019+list', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains keywords related to the lure. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness.

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://cctraff.ru/strik?keyword=free+xbox+live+gold+trial+code+2019+list In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_5f9626992a5c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392668/normal_5f9fc22e2f5ac.pdfIn PDF document text
    • https://daxuregivav.weebly.com/uploads/1/3/4/4/134431970/levaki_tizubisekafi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5f99091cdc05d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_5f9cb7d230a06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371246/normal_5f96556a13655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_5f9cbcb9d6d72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5f94549d7232f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/nea_ra_2020_runoff_election.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdd7fa82-698d-4e15-a95c-db17b81343e0/taloxajodorepukosa.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/61832560199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a499d2d7-7e52-4614-8d44-fb9aaa933c06/maxabavukategilaxef.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_off00007b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B69 5812 bytes
SHA-256: 0f1b6fabdec23503cb074ac849a902a57a2626c01a11e28afc36a1a0108fea04
font_01_sfnt_off00008f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F4D 11092 bytes
SHA-256: 178ae4c662c7ddc332bf08b82bc8278c913d17b6f8a6f04ca8fae7da43635fec

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