Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f79d962e986274…

MALICIOUS

PDF

46.6 KB Created: 2020-10-28 18:09:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: bf9b995e3d18b2f8e2eaa8dea3a56172 SHA-1: e1f1fc52efd1b035a715c7cde831dc751e1e0ff6 SHA-256: b4f79d962e9862746a9ec02eac96bead8eed9fb2a5be626925947e84112d4bd0
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://cctraff.ru/aws?keyword=free+printable+tooth+fairy+letter+for+boy In PDF document text
    • https://detosujedeke.weebly.com/uploads/1/3/4/3/134371576/168232077.pdfIn PDF document text
    • https://sazojowob.weebly.com/uploads/1/3/4/3/134351878/juwaturax-sarovukuwuraf.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/1458682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378628/normal_5f8ffbcf28e4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_5f9875eeb81ac.pdfIn PDF document text
    • https://xokafewapi.weebly.com/uploads/1/3/4/4/134488510/sosuzabubezugumonizu.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/f9007.pdfIn PDF document text
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/dexafur-wikonuvuwo-pepefonijapiw-semidaredifol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384822/normal_5f91d6061cef6.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006dc0.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006dc0.bin)
    • https://s3.amazonaws.com/henghuili-files/rearrange_pages_smallpdf.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/95296406844.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/52343386168.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9346/6521/files/arbys_nutrition_information.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/2216/4383/files/vsepr_origami_worksheet_post_lab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/riscos_ocupacionais_enfermagem.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/levasefazedebib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0973/5323/files/converter_doc_xls_para.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/0422/2397/files/vukuzazuzasavuzebidiz.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/gonatasefukokixi.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/o_level_maths_notes_download.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_off00006dc0.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC0 5008 bytes
SHA-256: 82bfe0609f452290c53c06102f7daddbd66246f56acac421d692d9bac04d9595
font_01_sfnt_off00007ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC5 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00008753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8753 11032 bytes
SHA-256: f6d2f3a2109b54fb3a4b8835a8edbb533bbf4507e3eb3f7f84be1ad2c7eca1c3