Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0625cdb3142cb5…

MALICIOUS

PDF

69.8 KB Created: 2020-11-18 02:17:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 00a1209c00826eff1c13e997561b3bfd SHA-1: 9f6fe03c389ab38ba70b375f44278d43be343857 SHA-256: 6c0625cdb3142cb5b14824106d59dc85d88d0619fa8233a67deee7c59907aa89
96 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating a large number of external links. One of these links, 'https://traffnew.ru/strik?utm_term=1000+canciones+y+acordes+de+guitarra+pdf+gratis+descargar', appears to be a malicious URL. The document body, though heavily obfuscated, contains text related to guitar chords and PDF downloads, suggesting a lure. The presence of embedded URLs and the ML classifier's high confidence score support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/strik?utm_term=1000+canciones+y+acordes+de+guitarra+pdf+gratis+descargar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387701/normal_5f988df8a44c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_5f8b1f6e13c49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5f8a0a85d2246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369316/normal_5f87df9d5bf80.pdfIn PDF document text
    • https://wavuvavezexa.weebly.com/uploads/1/3/0/7/130775629/5658328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370056/normal_5f91e89b0729d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_5f9d14f2ceea2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476122/normal_5fa91d0f5558d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_5fa0317a350bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d6bfe16-1c97-40d9-a0c8-5b7ff31b150b/64466204157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2613a41-3629-4852-861f-7be1dc981fe7/folivap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a6170c-bd7e-40a0-a929-4f840ca66a19/48188941108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe7f6457-7a21-4127-92ea-620eaeaa7feb/metropcs_locations_in_my_area.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_off0000cdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEF 5492 bytes
SHA-256: abc43282d9887729083c9649a8039efba4fc3b66955aa1e3bdd2a4e22950dfd2
font_01_sfnt_off0000e0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B7 12120 bytes
SHA-256: e233205974cd37264b898d7e42761d005c47eaced5d2f60d57c8a9ad9fa41625

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