Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d937c8e636b5cbd…

MALICIOUS

PDF

34.8 KB Created: 2020-11-08 05:21:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: c117997a018c6f9cd2468df7d45ed22e SHA-1: db27c13c3f725df50b0890abb8cd6650dcf7f997 SHA-256: 3d937c8e636b5cbdc6a9b0fc40f9783b70a4e34c2fd62ec925ac9866fe3f3b01
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffine.ru/aws?keyword=words+with+zoom In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5f97d275a47b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377407/normal_5f985303b96b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414486/normal_5f98a7608e6ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367923/normal_5f9a109ec9949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_5f904f1e1f09f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373511/normal_5f989090349b6.pdfIn PDF document text
    • https://gexirirexov.weebly.com/uploads/1/3/0/8/130874239/xejolufivaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_5fa42eaa86b59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385848/normal_5f906f2d0ff21.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
    • https://s3.amazonaws.com/lonozote/google_flight_simulator_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/epic_mickey_2_dark_beauty_castle.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/setokifexefizolo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4216 4540 bytes
SHA-256: c405c00275446492de877651759c08ff633644b7511088d4070c7da7e4d38242
font_01_sfnt_off0000519d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x519D 9104 bytes
SHA-256: 957d76f6efbfa8a1300f04ea63013e87c5489e717bdcea76495f0316660c9a58
font_02_sfnt_off000070e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70E3 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e