Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cf3d0baa106bd5…

MALICIOUS

PDF

45.3 KB Created: 2020-10-31 09:00:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 3a6dfb768446f35e30b152734891baac SHA-1: 391423f793c09359015806ff01129472f605ae1c SHA-256: 99cf3d0baa106bd52a4eb5c821e2ededf60219c4c7a4d53dc20dad7f8b6b96b8
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.link/123?keyword=paypal+credit+card+statement+code In PDF document text
    • https://vubisurajoguv.weebly.com/uploads/1/3/4/2/134265568/xidigolu_gumugobalonobi_sirotenonek.pdfIn PDF document text
    • https://lewixixidofuj.weebly.com/uploads/1/3/4/3/134393564/715924.pdfIn PDF document text
    • https://gesofomudejow.weebly.com/uploads/1/3/4/3/134344239/rerij_fororaj_kowilomoweboj_zeluma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380699/normal_5f91dbd6b2851.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/9799733cc743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_5f8a09c729fef.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00007176.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00007176.bin)
    • https://uploads.strikinglycdn.com/files/1377089d-12fb-41d9-8aeb-dbe1047f6dd7/5515126893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebe9be50-56f9-4e3e-8dc1-ce93d6c5a631/vemuviso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc89a19-6200-4b43-bfca-4351bf50942e/chemistry_crossword_puzzle_chemical_bonding_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af90c571-10de-4ae5-beae-14463f543b33/37767900379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61236c9-705a-42c9-9ce6-f38f6e86f82c/cs_intranet_gsi_corp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d36260c-3293-43e2-be5b-0b629a8ec32c/katawa_shoujo_different_routes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b8287f-ebe9-41b3-b9e1-3d70682d9baa/gufoxapu.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 extracted file (font_00_sfnt_off00007176.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7176 5320 bytes
SHA-256: ea472af42b4230274e020aea33dfd97f39e65abb727bbe6625f1da3c60bbe4c4
font_01_sfnt_off0000837f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x837F 10860 bytes
SHA-256: 9e9c33768e84c691878eae450edee8789203314c9b09a3d9f04ac34f25c2ddf1

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