Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c1dd36c6076d1f…

MALICIOUS

PDF

40.2 KB Created: 2020-11-06 04:03:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7a07d8f908d9e41bddc044307f696d47 SHA-1: 11e81f1e969f1b26402aab2821d5a7542b03ca76 SHA-256: 83c1dd36c6076d1fbe2d83dcd6bb20f993c9d4a023ad9ce836c5f475caeca04f
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body text is obfuscated but contains a reference to 'Leo club logo', likely a lure. The presence of numerous external PDF links suggests a link farm or redirection strategy. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://traffking.ru/aws?keyword=leo+club+logo In PDF document text
    • https://nagopajasire.weebly.com/uploads/1/3/4/3/134311949/0af605ac27d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403807/normal_5f928a2c81e98.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/tuzinisovedovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426413/normal_5fa47f7b42e94.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/22c91f8e-5278-45c1-b160-9ec0a478c4ca/gulesidalakote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/370294d8-2cc1-43e1-9b55-033f1851edf5/tefodaxifoxinasik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fefddad-95e9-4d5f-a4c6-b4ff964cc7c5/23047572958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6c72166-cb63-40c9-9ea1-365ce547afae/rifupukopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d8773cc-e2b4-4b09-9a84-efb2360a8ee3/liteboleg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6e033ea-34e3-424d-818a-137e4896d5e5/86238535065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f6a3611-7bc1-49a3-8b73-1e22fc2a9d80/sukojevovosikeko.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/icao_annex_14_volume_1_7th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85883f1a-31c1-4977-9e44-52a1cc3f067e/fizijet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbcb8e66-4c2c-406d-8129-76abab672b78/73560472589.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/warrior_pvp_guide_wow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb5b9d1-1aea-44f9-b123-e3a4d9d41408/57112437528.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_off00005ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF8 4564 bytes
SHA-256: 6cb8dcfe45d193fa60ce0b5f5fe146c6071044169e9e770f0e7ca6e7e4f44f7e
font_01_sfnt_off00006fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA0 10660 bytes
SHA-256: 5d9cf91150bb10be4073eed0c8bf6c5b986dac63e47088290852eb8882bcaa39

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