Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a2b7fe4ed1155d…

MALICIOUS

PDF

37.2 KB Created: 2020-11-02 18:04:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 20c632f27b342174d74d8ed9499be3b2 SHA-1: 5b6c99fd8344042a4319db6971899a45a63034b0 SHA-256: 83a2b7fe4ed1155da1006380a15b76d384e33cf6e5bc86d20342ef15aee37c51
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One of the primary links, https://cctraff.ru/aws?keyword=phim+bo+han+quoc+long+tieng+viet+nam, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to Korean dramas and the URLs, suggesting a lure to drive traffic to malicious or SEO-spamming sites.

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/aws?keyword=phim+bo+han+quoc+long+tieng+viet+nam In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369633/normal_5f88c87ed1f1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_5f9bcac668d73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5f895457bdd0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f87830fc6fb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416321/normal_5f9d7846c81d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379234/normal_5f9238b53bf51.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/xamapebonijos/the_case_for_christianity_answer_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/529e413a-bf12-43c5-b8e5-241a87be2933/29650324140.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/sufenigejajiwaji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0518/8515/files/rebikuzedovisodenixikisaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b649b1-6cc1-43c4-8b81-40da8fa460b0/34374466648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b2de3ee-d8e5-4839-b661-3d2d229f4a1f/50213589413.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_off0000532e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x532E 5264 bytes
SHA-256: d8a5bebdf5852043cbf59be118b49d7d6d1cf47b0e4a5e035f5e1a6ced34de4f
font_01_sfnt_off000064fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64FD 10608 bytes
SHA-256: 8f039515c14e68b35dc1f1b5f258d6ff1cf473fbe5089514dece685c2e3fe8f9

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