Malicious PDF — malware analysis report

Static analysis result for SHA-256 c755c1c194d417a8…

MALICIOUS

PDF

41.2 KB Created: 2020-10-27 14:17:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: fd830f8604463a095da49c72f48d43cf SHA-1: dd390f55aa50d93333e2ce8b147e385c357664d5 SHA-256: c755c1c194d417a82af10d2acd7a27fd8b92efa335f6146b683cf6c93e299247
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=last+day+on+earth+apkpure In PDF document text
    • https://tefimapotile.weebly.com/uploads/1/3/4/3/134351392/ponipef_bidunuxu.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/puxijidip-wasaj-tekurajosi-boxifebuwejefev.pdfIn PDF document text
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/101601.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/fatafanutojor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_5f8b56d45c8f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_5f9529b31959d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5f95b22b4d775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_5f9501b201732.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/gupuso/sevapabav.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/18618930293.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/plant_ecology_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa2a9c9-1e42-4671-b2cb-a8895356ddf0/63328226340.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/66150982668.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/medical_summary_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/bharat_ratna_award_winner_list_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/wazidobamasisejiza.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/70615912761.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/91177163872.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/63036884378.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_off0000636f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x636F 5124 bytes
SHA-256: ca19ddcf684e4a19690d803657d5a877af5661570d9628f6e6639bebff0104be
font_01_sfnt_off000074d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74D8 10304 bytes
SHA-256: dc1b47f0081e73727cb104e5c1b96838f9ce5c53ef1015d7398a66d2f42f0261

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