Malicious PDF — malware analysis report

Static analysis result for SHA-256 609b51dafcbb414a…

MALICIOUS

PDF

45.7 KB Created: 2020-10-26 22:32:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 1caa9f95f7a37e6dc76bc31e3f20c2c1 SHA-1: 1ce121b32242e13df63f6c4ea73ff81da3fba512 SHA-256: 609b51dafcbb414a78b95c66106f18bae0224ecbceafb4f1e1c5367d7eac1778
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://cctraff.ru/123?keyword=long+beach+street+sweeping+map In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371800/normal_5f8ee1593a002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_5f95e7f64008d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_5f8f1efbed542.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000071ce.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000071ce.bin)
    • https://uploads.strikinglycdn.com/files/5a6b211b-cf34-441e-8730-d34b616b6091/fuporuwewowavuzawok.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/59640434842.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/mevirika.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/wegisazav.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/86424491503.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/wubafesegedatobitilaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/bovinigosenewilavasixom.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/indian_sports_personalities_list_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/73050540201.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/rodejerib.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/77564528654.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/past_simple_regular_verbs_positive_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/25652710435.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/2927172414.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/xovububobaxizew.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/55254100152.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/gimomojenimotuviwanij.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_off000071ce.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71CE 5488 bytes
SHA-256: f7db86614d8736a2b3e7ca225d60557f01c2a1eb43eb8cc9ad4226d59e7efb06
font_01_sfnt_off0000846b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x846B 10992 bytes
SHA-256: c3d7b055ea539150ad1e58bd76c426d6157199a533025b355b29f118c0b3371c