Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9df551f805351b…

MALICIOUS

PDF

37.4 KB Created: 2020-10-25 07:19:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 7ff6d9480930ae6c2566869a80422585 SHA-1: 0e0e3d9a8c8fcdc9f4339d842cb9444a2fc310a8 SHA-256: 1d9df551f805351bdfd03916bf33dc8b10aa25910cc2d65931878ebda4db1c81
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.me/123?keyword=maths+worksheets+for+ukg+icse In PDF document text
    • https://juregirezixo.weebly.com/uploads/1/3/4/4/134401856/kutapi-sosofibof.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/kulezewutabutitew.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/nenez-nizojififi-tudiwagorof-wadon.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/1949415.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/96aab1d6-fbde-4f64-8efa-7d34fd01ad9f/megozivapelomeguburu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd00d136-e5fe-421e-868c-4d29dfe9e256/hematologia_clinica_mckenzie_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc465be7-6063-4d11-ab9c-2269eb9c708c/dokatapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28147320-a41b-43fd-a0c4-276ae9028283/60598113477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05d3669e-5a5e-48e5-bcda-c11b834ff371/city_of_ember_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fcb669c-ce56-4d38-a517-ae612660a24f/pevakebono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1031a962-f6d9-4263-8aa1-8de178b9f549/37778450422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6087787-08ad-4dbb-970d-ce23dc63d661/fixasusidukak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6603/1775/files/frayer_model_printable.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/29192768174.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6403/2925/files/quasi_judicial_power.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/temajifewuru.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/berceuse_chopin.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/63997206192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c69b6bfc-766f-47ba-82a3-a20ba44fec63/bivipudevugovavuperemuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ccfd316-f718-4d16-ba78-3cd86f5126f2/niwajirujupevolojifutev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f4a66ca-184a-4665-85f4-a3c666400fdf/pezopupujibawetolumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1cfa737-f3c3-4e86-b355-5557069a3095/zufosigibazabesisotigav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f7c3a6-bf40-449e-b37b-11853ba49d5b/pemewugizufumobodaji.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_off000052fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52FE 5272 bytes
SHA-256: cd402ed78e2a7892957dbb4914e51fe96d581a12d453f30ddf1bb52ae793e005
font_01_sfnt_off0000650c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x650C 10504 bytes
SHA-256: 9c4a2cfd8a09a2055d86d52eeea6870a7e626dd93bf7bdc9c259da660857b7fd