Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f88f84368dff3f…

MALICIOUS

PDF

52.0 KB Created: 2020-11-09 05:01:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 7f99c8bdf59b2a888edfb336bb0f7ef2 SHA-1: f916eb80450b30ab4fcf6da24665a5ac099bc7d1 SHA-256: 38f88f84368dff3f154e59d32f4d05680d675dcb04c09049d16f3ed9ae32ff2f
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/aws?keyword=no+man+s+sky+fighter+ships PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5f87239c50d12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450898/normal_5fa309b733d57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376371/normal_5f959ddc20e79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_5f8f8742e5dd2.pdfIn PDF document text
    • https://velabusodogir.weebly.com/uploads/1/3/1/8/131858366/gixefow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388813/normal_5f9628e94f3b6.pdfIn PDF document text
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/4345423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5f959739e7d8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_5f9ec5f5e9106.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/64048608-69ad-473f-80ba-adb5994b3ab4/ta_main_claudio_capo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5999c18-ae4c-4a85-90ec-53b507100c66/smart_launcher_5_pro_apk_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/tlr-1_hl_on_glock_19.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/basic_technical_drawing_spencer.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_off00008b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B07 5420 bytes
SHA-256: db39f7bac70407f59b99e78c8ca79ef0b458792448b18575d8829a2d43957405
font_01_sfnt_off00009d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D5C 11132 bytes
SHA-256: f86100ffc18b2cbfd32a0c2af28032b30cb60733cef7f5ccf4b01908df4ea2a9