Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c376c63557fe61…

MALICIOUS

PDF

41.9 KB Created: 2020-11-02 18:34:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 00f0fca6905053d073719abe27b4b036 SHA-1: ae5c5f762dea132e4366e016eb3705c75f2a5ad4 SHA-256: b0c376c63557fe616bfbc4f5532dad4dde457e870ec77e62c7fe5381bb4f233e
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.cc/123?keyword=the+abyss+surrounds+us+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_5f89041093bc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5f887e7a4e13c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_5f972df48800f.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/1/0433/6009/2309/files/xumigawekisalekadu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/9160/7711/files/parts_of_the_blood_worksheets_for_kids.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0508/2107/1033/files/uc_browser_apk_latest_version_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2334/9938/files/patpet_dog_shock_collar_with_remote_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/64812870032.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3968/5799/files/night_vision_scope_camera.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2907/2552/files/58525320396.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7443/5221/files/40991437280.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_off000066ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66CA 5288 bytes
SHA-256: 67d064979eb711255f80bedce524dc4dedb2b4a1d123c1cc35011aec114d5a95
font_01_sfnt_off000078bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78BD 10184 bytes
SHA-256: abecf088a20b66f5df09b1132666e03890d52ea393d4f1489b98e91841d98909