Malicious PDF — malware analysis report

Static analysis result for SHA-256 4534ff76565c2385…

MALICIOUS

PDF

40.6 KB Created: 2020-11-03 23:19:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 73756895b736c42a0cdb8c19f9ec9ff5 SHA-1: 283478f8693465f101b50db707cf0ecd6b96f75f SHA-256: 4534ff76565c2385d6b98f77feb4e8c4d2d264ef918a12c3a7188c59108c6747
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.me/123?keyword=buckeye+high+school+football+maxpreps In PDF document text
    • https://cdn-cms.f-static.net/uploads/4457854/normal_5fa1a954eb3f6.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/digokasawuj-jipamuputevuf.pdfIn PDF document text
    • https://nipefewemaxu.weebly.com/uploads/1/3/4/3/134387654/d7d6321ea0c8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382781/normal_5f962b01b4b33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393511/normal_5f8fb508f2557.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/jonilapum.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/kejefakutisorivaxokimixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b98c605-bf6f-4f49-9a3b-3e58d415d642/dvd_games_emulator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06f791dd-7ea7-4598-bae6-ee36b2a623ab/97825489610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a98d649a-b553-47ab-857b-5157c0b41791/raxijulurenukos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b66c8c-3f9b-4d93-a49e-b7db08076d44/wovuwuxifunujoxowon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dd36c64-3f15-491f-94ff-f8cf82f9bd78/winixenevezepenibu.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_off00005e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E86 5852 bytes
SHA-256: f0776c0992c16a24a17987e59470d988d0b5b519e0e4b951e8f88cca1a87114e
font_01_sfnt_off00007264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7264 10396 bytes
SHA-256: b770f2ed420fc2f5b0ab2647ba814686eca0775ea8a5856e33bab33c92a6a754