Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9d49d8b619dbf1…

MALICIOUS

PDF

47.6 KB Created: 2020-10-10 19:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-02
MD5: c461e0f7aff6030f42543027167e8562 SHA-1: 75ac1f6201f0da58817de155c60362396aeb0c77 SHA-256: aa9d49d8b619dbf17cbdfc5998644fad3c51f09179e6ac8136e83204bc340169
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://cctraff.ru/strik?keyword=chantez+au+seigneur+un+chant+nouveau+partition In PDF document text
    • http://files.classicmassagestudio.com/uploads/1/3/2/3/132302940/luzugudevizilim_ravixerulamuna.pdfIn PDF document text
    • http://files.pinewoodnaturopathic.com/uploads/1/3/0/7/130739621/dawimurazepob.pdfIn PDF document text
    • http://files.arthurkeeganbole.com/uploads/1/3/1/4/131452815/rukekuvazexidise.pdfIn PDF document text
    • http://tamame.pastorbobnlnh.com/uploads/1/3/0/7/130775129/xonozuvirejose-xiwazemaluje-wedofulavi.pdfIn PDF document text
    • http://files.eastoakmenu.com/uploads/1/3/1/0/131070993/rapewor_regajiwozebaza.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000048b1.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000048b1.bin)
    • https://uploads.strikinglycdn.com/files/2e7b0fb3-f8de-4351-81b1-1a8c0f4cb145/pewos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f56f05e5-5163-4a5a-8100-cb5207866c0f/zugidofedunoxefoxif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b359f139-4357-4e84-8eed-0b5131712e8e/votobozarero.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5053/5578/files/548695255.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2130/2946/files/presidentes_de_colombia_1994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6545/8342/files/murogoxaregimogazinodisir.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_off000048b1.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_03_sfnt_off000092b1.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_03_sfnt_off000092b1.bin)

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48B1 5180 bytes
SHA-256: 1054aaf6399b5f0591dcc72c8d1baea52f288d7fd66ba0a41c1f80f6c13e982c
font_01_sfnt_off00005a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A51 6136 bytes
SHA-256: 99c8e6cc33de4e8b8c88725b131c6e1117b7dbd4e29c8793d1c1b20cf630798d
font_02_sfnt_off00007033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7033 10552 bytes
SHA-256: d7c0e9cb2074323abdafc16837f21fdbce65dd6e2808901534e2d0de1e9f53a1
font_03_sfnt_off000092b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92B1 16400 bytes
SHA-256: 05a1ca83c811f41124e080f21f76b337c0bd6801b63b5e5cefafe6ef968cdfb7
font_04_sfnt_off0000a875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA875 1736 bytes
SHA-256: 1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19