Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3b5713514b507f…

MALICIOUS

PDF

40.0 KB Created: 2020-10-03 01:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 4e4ee9739e43bb5fcd5547f2f83bb40e SHA-1: e7f9cd0aef7429764edc419c6c26e4f34365a093 SHA-256: af3b5713514b507fde8d2c8e295390f6de020c86967f21dacfa3055a3c50d912
224 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.link/pify?keyword=the+animal+cell+cycle+worksheet+answers In PDF document text
    • http://files.rchsbands.net/uploads/1/3/0/8/130814605/solafulebid.pdfIn PDF document text
    • http://files.tnmshop.org/uploads/1/3/1/4/131407222/wipenoxef-puvugowimavimi-tagigizodawupow.pdfIn PDF document text
    • http://files.jsphotographycapturingthemoment.com/uploads/1/3/2/8/132814969/a031992.pdfIn PDF document text
    • http://nulaki.julietrosesoaps.com/uploads/1/3/0/7/130775654/9315767.pdfIn PDF document text
    • https://site-1037169.mozfiles.com/files/1037169/13472505821.pdfIn PDF document text
    • https://site-1040048.mozfiles.com/files/1040048/93645716458.pdfIn PDF document text
    • https://site-1040359.mozfiles.com/files/1040359/74703236098.pdfIn PDF document text
    • http://puzexerur.bourkeysblog.net/uploads/1/3/2/3/132302936/ledijasekukiranezov.pdfIn PDF document text
    • http://lawivun.dandavisonmusic.com/uploads/1/3/1/8/131871456/jutetujafamup-kuvageb.pdfIn PDF document text
    • http://fawojogu.gunnessfinancial.com/uploads/1/3/2/6/132696280/13607d588ea4e.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/1/0429/9902/1731/files/steelheart_shes_gone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/digital_timing_light_near_me.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3884/6371/files/53037912023.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_off00005ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE8 5248 bytes
SHA-256: e1d2762f76954af05cbf640da66c7c4841a657c55284be2087bfed9ee52ce0f9
font_01_sfnt_off000070a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70A6 9968 bytes
SHA-256: 1c49b6c880c2f391e2ca567c5dc84d168e0951ae4c42e7494d64618a3a425023