Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef045503e2c6acf8…

MALICIOUS

PDF

38.9 KB Created: 2020-10-28 14:38:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 234d42f9bae7da6cd211c6cbffb4d947 SHA-1: b550b96519a6791388d5bcaa2ccd19f366ff1367 SHA-256: ef045503e2c6acf8af42bea6462573cd3d7555e6b67225a694ad5f8664a3178e
184 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=diana+hacker+rules+for+writers+7th+edition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_5f9206e943c6c.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/wixegitosadebegin.pdfIn PDF document text
    • https://wusoxebuwewete.weebly.com/uploads/1/3/4/4/134432123/jubumimob_lusejitim_bomalume_xuxixegemor.pdfIn PDF document text
    • https://tuvozejuwubox.weebly.com/uploads/1/3/4/3/134323710/leveladilirarem_wivonufose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f875cf5ed0a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_5f8e28463726e.pdfIn PDF document text
    • https://pexazunawilaga.weebly.com/uploads/1/3/4/2/134265520/wovijefovujukugijori.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/913438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420222/normal_5f970ad433dba.pdfIn PDF document text
    • https://mijelowiwiloz.weebly.com/uploads/1/3/1/1/131163856/1048627.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/8c3f11ed.pdfIn PDF document text
    • https://ruxibero.weebly.com/uploads/1/3/4/4/134403554/c3955d2ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0118/6973/files/71642514731.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2608/7575/files/91174577209.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5741/2779/files/kokexutuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be198b62-96be-4aaa-ba31-f5c3daeccd00/77972111267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b53d256d-0c88-4235-967e-7672083f457e/how_to_find_a_redstone_mansion_in_minecraft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/275dfe73-363e-4a3b-91af-e147c8b63bb9/18369088258.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6135/3889/files/vhs-c_to_dvd.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_off00005930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5930 5480 bytes
SHA-256: 03f83b697ff4c815306d355286572c62bd66843dc849420e569e8f269884b760
font_01_sfnt_off00006bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF1 10104 bytes
SHA-256: d074e2d93e24d8debe06322e2e52b28b9164592459fd10e08a748ecbd826e8c9

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