Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83b21008587253b…

MALICIOUS

PDF

45.6 KB Created: 2020-10-26 10:21:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 88000322d6a30c7e14836848194b09ab SHA-1: 1209d178bcb84c3d62feb9e2654d334200ea7209 SHA-256: e83b21008587253bdaf10fc7fc2f44668bd73477d62e0efd2ca7483de3b353b3
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://ttraff.me/123?keyword=us+citizenship+test+2020+pdf+spanish In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371800/normal_5f8906cbdb5fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404285/normal_5f9462d45278f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369519/normal_5f8d59cee31b0.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://uploads.strikinglycdn.com/files/21b8925f-1b52-47f9-99df-843a545f5c64/dizujawidotepigusove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/380e847f-cc4b-4f29-86e3-128e107faf0d/wulilugepukafawogoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/665b1331-6ff1-4419-ba88-ac3497c90530/30090185785.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/5736/5159/files/android_antivirus_test_2020_tablet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6243/4210/files/nepaxabibututugepube.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9155/0104/files/62970739794.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8361/9232/files/nafixazinuvozobixol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ffcd5f-0587-4d07-9959-a011ddaac82f/wijagibubukajufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bff83ed-eda8-423b-8bb6-566ffffe9c57/69409724948.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/5118/4028/files/oriental_theater_milwaukee.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/yuki_japanese_restaurant_hoover_al.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5466/4342/files/minecraft_superflat_presets_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/apache_spark_scala_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/oxford_dictionary_english_to_bengali_free_download_for_android.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_off00006765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6765 5108 bytes
SHA-256: c83d16e585482c034ea085b753afcde0fea86a317e61a41cfc87f64297738d50
font_01_sfnt_off000078c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78C1 10148 bytes
SHA-256: ec63f33584db7e7417154ccb1cff15e8edc72159612f2eb60cf8d7c4537a5619
font_02_sfnt_off00009b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B48 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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