Malicious PDF — malware analysis report

Static analysis result for SHA-256 328e9a7fc3396c00…

MALICIOUS

PDF

53.2 KB Created: 2020-09-30 12:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: a0feeb3198eb78ba3283fe69e647fde7 SHA-1: 7df002cac80ed4fd778a43284273ee132ea2490a SHA-256: 328e9a7fc3396c00d50acc19b450768cad22301b885feb0c5af2d6681520ffe0
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://gettraff.ru/strik?keyword=aristotle+eudemian+ethics+pdf In PDF document text
    • https://site-1037891.mozfiles.com/files/1037891/zurisisadipalap.pdfIn PDF document text
    • http://files.wcnsplay2learn.org/uploads/1/3/0/7/130740082/1102602.pdfIn PDF document text
    • http://bofemo.richardbuckinghamfurniture.co.uk/uploads/1/3/1/3/131382539/jewigevagupebajoju.pdfIn PDF document text
    • https://site-1036799.mozfiles.com/files/1036799/18632656417.pdfIn PDF document text
    • https://site-1037114.mozfiles.com/files/1037114/89037042974.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5581/5583/files/certificate_designs_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9390/7869/files/xejuxakeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3549/0461/files/1498851520.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6278/8245/files/rpg_games_offline_android_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8222 5264 bytes
SHA-256: 895745f48061a3d750c9322986686207d382bba381bf7d60dab861d776402713
font_01_sfnt_off000093ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93CA 11536 bytes
SHA-256: c2ef66d3038aab83ab21660e155f0f86f5b09de04333878467b407c6b3c461fb
font_02_sfnt_off0000ba61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA61 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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