Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a9ed81bc941b1c…

MALICIOUS

PDF

54.5 KB Created: 2020-10-04 04:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: ef5ffbeaa9d5fe3d5f089d7df93b77d0 SHA-1: 7edb77381c1826211cd5080702bfffa20f5e3768 SHA-256: b3a9ed81bc941b1cc1603457f66356d3727f9e32cdcb8e5eb0bf2dc7045e6757
174 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.
  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://cctraff.ru/strik?keyword=health+the+basics+13th+edition+test In PDF document text
    • http://vuladeg.streetbridgeinn.com/uploads/1/3/1/3/131383493/7c1cc.pdfIn PDF document text
    • http://files.kellycunninghamcoaching.com/uploads/1/3/0/7/130775231/fabonat.pdfIn PDF document text
    • http://kobetu.midnitehellion.com/uploads/1/3/1/6/131606755/1145372.pdfIn PDF document text
    • https://site-1037868.mozfiles.com/files/1037868/vujigexim.pdfIn PDF document text
    • https://site-1036702.mozfiles.com/files/1036702/bisevidolijilabamolate.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/6bc98e62-050a-418d-af4a-5964edf221b7/99055654206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07519647-2ce1-431e-92e4-a2b280b2642c/zekevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b72b5ed-d03a-4c3b-976e-887340c72374/vudoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56abcfb0-524c-4922-8a5d-03ec3df5576a/10739746188.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9848/9503/files/prima_pappa_high_chair_straps.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2006/1342/files/charles_bukowski_post_office_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5926/3141/files/70329282720.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9626/7168/files/jumanji_welcome_to_the_jungle_watch_online_reddit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7977/7952/files/vidmate_apk_download_9apps_for_android.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_off0000981b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x981B 5248 bytes
SHA-256: c51dd627200bde2d98854babde8b9aa74aebb1e90aa6d0798ebfc3eec438f4fc
font_01_sfnt_off0000a9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9F1 10224 bytes
SHA-256: 8caa6d35e7abc9db96a3af365abcdd576ec95242058f3a83e7b525168bb3407f

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