Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1cb796d57257d9…

MALICIOUS

PDF

63.7 KB Created: 2020-10-20 17:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: e88187ccd88fd843632c909b0f34d111 SHA-1: 77af71e2682897e7e80601c169c69dd2d84e33d4 SHA-256: ec1cb796d57257d9b209c2738919f3af6973686c5ca16714f7a01cdc588060ab
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=rajasthan+police+syllabus+2020+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f893af0e8cc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5f897711ce04b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_5f8c6d371b7b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_5f8b2c47e8e76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_5f8e61d1bd016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f8d0bc7f2c28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378170/normal_5f8dbe3cbb7d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00007b74.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00007b74.bin)
    • http://fedorahosted.org/lohitIn extracted file (font_04_sfnt_off0000d505.bin)
    • https://s3.amazonaws.com/zuxadol/18272858752.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/17246952489.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/93065187955.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/9174/2886/files/jersey_city_school_calendar_2016.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6857/1294/files/moana_full_movie_online_free_123movies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2479/2224/files/ring_size_guide_european.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7971/9317/files/nujezaxulefas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7115/2023/files/reactivos_de_flotacion_de_minerales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/694bbddd-c89e-497d-8b99-47311dc00ee5/gifipekataregajeburuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb272091-c31d-49ec-a688-a7d6437ae388/69526432165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d562152-f137-4579-9bd9-dd2e04d9209f/80807181489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46576ef0-068c-47c0-baa1-d7f4402d69d4/nubamafapomojivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cb7dcd7-28a5-4599-8db7-2015521cb888/dimoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2707/1127/files/platte_valley_high_school_staff.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/2417/7093/files/curso_de_economia_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/zotikin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/ruvalamilemepuvu.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_off00007b74.bin)
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn extracted file (font_01_sfnt_off00008f5f.bin)
    • http://www.gnu.org/copyleft/gpl.htmRegularIn extracted file (font_01_sfnt_off00008f5f.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_03_sfnt_off0000bffa.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_03_sfnt_off0000bffa.bin)

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B74 5840 bytes
SHA-256: 4585b72d5565c2727d31cb835bf5abb1cb24b9f9f68d4d5e58cbc69df9329cb6
font_01_sfnt_off00008f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F5F 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off00009ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC2 10888 bytes
SHA-256: f56baae93205b9320179f076911b04c93496afb46608194953ed07f76f84c477
font_03_sfnt_off0000bffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFA 16112 bytes
SHA-256: 275d0ef8f619a30f75d5b67021c85ffe51dbf44d82a44ecb2d07128ff93f9399
font_04_sfnt_off0000d505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD505 7904 bytes
SHA-256: 58e82134153ade0e150733bb2651e3cc512aa3cba4601324abad630406fe58b2