Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff8671148bc363c…

MALICIOUS

PDF

52.3 KB Created: 2020-11-03 09:03:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 3aea14a9458a3304cb7a6c1b827084b8 SHA-1: 5aa5348241ae5bf6d934154b5d1bcd0357c7fc9d SHA-256: 4ff8671148bc363c3958c7409ba5c3bc33bad05599b7883feab0f7f58fe1aa65
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://gettraff.ru/aws?keyword=brookstone+mini+projector+manual In PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/gowaw.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/4ced4a08.pdfIn PDF document text
    • https://tuxupifogufo.weebly.com/uploads/1/3/4/5/134594750/485367.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/38660854-1dbd-4c71-84b4-6ba34e051f3f/samsung_dex_for_pc_beta.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/rofasanew.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/careless_whisper_piano_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/living_environment_regents_questions_by_topic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a086568-6396-4aad-a678-7c3e6ede936a/vujemiguxeporetemujasadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7275018e-d0ac-4737-8160-70ffb568cf63/wijawezetexuvel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc2c8cc-b85d-4caa-bca6-e003c7652e81/63512440540.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/aliphatic_and_aromatic_hydrocarbons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52d58bfa-043b-4a57-8e8a-104a01b5893b/finosokej.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/under_night_in_birth_hyde_and_orie.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_off00008393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8393 2828 bytes
SHA-256: 4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9
font_01_sfnt_off00008d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8E 5268 bytes
SHA-256: 840e54a0abd648ec19e6dea67e0be0f33178c62d5a91a296957135039b22d042
font_02_sfnt_off00009f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F67 10752 bytes
SHA-256: 77a50ab978e97229f28d0be43b5ecdc40e3b93fb0f54e97a7e5efe7509207d65