Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac756c4ed71e886f…

MALICIOUS

PDF

48.6 KB Created: 2020-10-15 20:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 20abb7067b1b2a4966707c628e0e8a51 SHA-1: c447190eaa1872174c16d94ec03ab9d6d43d9776 SHA-256: ac756c4ed71e886feab2606b9a11802fd29ef40ab2dda7d47ad78c80c145f1c2
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/123?keyword=pared+celular+de+bacterias+gram+positivas+pdf In PDF document text
    • https://site-1044012.mozfiles.com/files/1044012/tebezuvokagi.pdfIn PDF document text
    • https://site-1043204.mozfiles.com/files/1043204/fadexujavupavexovule.pdfIn PDF document text
    • https://site-1036805.mozfiles.com/files/1036805/vusotudofubuvif.pdfIn PDF document text
    • https://site-1042016.mozfiles.com/files/1042016/67515744641.pdfIn PDF document text
    • https://site-1036819.mozfiles.com/files/1036819/73099602511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f876046d47fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f872fb34ae38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f87bf7fa39ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f875ab2ae78a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5f87f9de24538.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/d62e0a5d-9c9f-4aaf-8661-29da194c1242/10188347286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f491cf67-5312-4d7c-afa4-1597a9e429fe/wadepusibag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25a6f591-b9bd-445d-b843-0e3b10dce994/13763868885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990b3ac7-df03-4673-af47-df77058bea34/zigozip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/644d19a8-570d-4946-9df6-9138f3d45b0c/91564563950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7898b2f-a025-4b3f-828c-024ff42f31cb/78916085795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4964d98d-86c4-4110-ad4e-03c0c13ad4fa/bedigujud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/378cc887-fc0f-4873-9428-4c5b1aa5d530/difipevas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ee2261c-a387-45ad-ad42-2285e5ca69d5/77881259151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e93a32b-9700-4a62-b6d1-274ef18754a0/bofexufenog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88defb70-d537-4c36-9f14-081442b027dc/33023926092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a13ce9eb-a98d-4fe2-b9e0-4b9a1fa2b3ae/44927315812.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_off00007c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C76 5676 bytes
SHA-256: 58c2b26032ce70a26261d18d569551a972a78c519e590bf098a131f8d48404b5
font_01_sfnt_off00008fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA5 10716 bytes
SHA-256: 1629a41c36587c17fca47de84335b27c57c4b3cf108e08c10e13cec396d46744

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