Malicious PDF — malware analysis report

Static analysis result for SHA-256 6231bbdbf8a36a59…

MALICIOUS

PDF

39.6 KB Created: 2020-10-25 03:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: e0f197bdfbeae4e490c4ee312f0f2676 SHA-1: 155825521324d86631ce9a2a3bdd8f28aa76284a SHA-256: 6231bbdbf8a36a5955e4a8d06b3b74186d99b27dd301b9beea4d9ba374abed74
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://ttraff.com/123?keyword=weiler+lathe+instruction+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5f88f9eb54969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372354/normal_5f894264def1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403685/normal_5f927496503ba.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/1240458.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/c36a399f768.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/mewamibiniwow-nuxalipanedim-wuzaxolu.pdfIn PDF document text
    • https://jezafemobad.weebly.com/uploads/1/3/1/3/131383748/kupalel_mivisesa_tinudosaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4415/4791/files/3802825812.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1378/1157/files/candidiasis_oral_caso_clinico.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1673/0799/files/auckland_council_soakage_design_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3667/1637/files/jadokaref.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3707/2794/files/history_of_pots_icd_10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1058/7291/files/113056661.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1688/6678/files/download_helix_jump_apkpure_mod_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/9957/4438/files/99146381381.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4523/1515/files/48579182781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a5bba28-4dce-433e-a3d4-2140161ed458/merogelumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e478efd-2945-4dff-8ae6-17643fdc44d4/77519342039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57624362-28c9-45ca-b3f8-3ecf5f371bc3/como_resolver_operaciones_con_fracciones.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_off00005b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B70 5052 bytes
SHA-256: 9e9b7e49918e35b56dd010e95636601d4abc81e2bf100662fb38c35f706b5fb9
font_01_sfnt_off00006c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7F 10796 bytes
SHA-256: 4a6b79198fe3c3d670d98bfcc25965eb4d62fe9c10592a2a20e097b418f8a5dd

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