Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd943cc1af81e41…

MALICIOUS

PDF

50.5 KB Created: 2020-10-14 21:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: bb84c1d63ad11929f2bc5a94dd5c4956 SHA-1: ef660838ff89bf2571764b67854b2f301dd7bbcf SHA-256: 8dd943cc1af81e4136c5a1f658d5f158291f0cbd8ee3a13d0e2ea36c45b3ebce
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://ggtraff.ru/123?keyword=punnett+square+practice+worksheet+high+school In PDF document text
    • https://site-1040777.mozfiles.com/files/1040777/veter.pdfIn PDF document text
    • https://site-1041387.mozfiles.com/files/1041387/zexugixigok.pdfIn PDF document text
    • https://site-1037865.mozfiles.com/files/1037865/napetomakixa.pdfIn PDF document text
    • https://site-1048208.mozfiles.com/files/1048208/vugavowexasewufoke.pdfIn PDF document text
    • https://site-1040248.mozfiles.com/files/1040248/zowofebunusubem.pdfIn PDF document text
    • https://site-1036957.mozfiles.com/files/1036957/2309320010.pdfIn PDF document text
    • https://site-1040144.mozfiles.com/files/1040144/rozefose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f870a8922d02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f8707ef2de1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f873104d17dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f87272ee1cea.pdfIn PDF document text
    • https://site-1036930.mozfiles.com/files/1036930/38280350761.pdfIn PDF document text
    • https://site-1038460.mozfiles.com/files/1038460/42971847148.pdfIn PDF document text
    • https://site-1038789.mozfiles.com/files/1038789/finisuzorevux.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://cdn.shopify.com/s/files/1/0488/3437/9941/files/xopuxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6818/6015/files/gowodijexowij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/6190/7108/files/24331011739.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3441/8586/files/nudig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0599/5940/files/the_vic_shop_fuel_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f56f05e5-5163-4a5a-8100-cb5207866c0f/zugidofedunoxefoxif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0190fb64-1f97-48b6-9d34-86965da3f9db/fefizexoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a200b0c8-18f4-4ced-8be8-88b10c997883/zewixopawex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb3ea7b2-b773-4d25-8b28-dc0a0b6abe7e/91860229635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef21408a-df02-4992-8388-44ada237a2d6/1398463765.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_off000078ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78AB 5360 bytes
SHA-256: 5660414cc1b167f5d24e29b7915779f6e32fcd1029e63d3fae597cf12bc3d90b
font_01_sfnt_off00008aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AEA 10384 bytes
SHA-256: 041039583677902cd1987834757be98650746d4e4e775151d1714d4affc9af29
font_02_sfnt_off0000ae27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE27 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333