Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc4a43dc0f66143…

MALICIOUS

PDF

41.8 KB Created: 2020-07-08 19:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c445b0d263dd8ff9b6990b04e6efa51 SHA-1: f82108fb5dbb3c8efaa0457622e896bf1c79f7fc SHA-256: 7cc4a43dc0f66143250aeaaa5abad875d31f513fe78352e50df62849fc835c53
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links pointing to various external PDF files hosted on disposable domains, indicating a link farm likely used for SEO manipulation or to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a potential for further malicious activity. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest a malicious intent to redirect users to potentially harmful sites.

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.ru/wb?keyword=javascript%20exercises%20for%20beginners%20pdf
    • http://files.redesignforwholefamilies.com/uploads/1/3/1/8/131857193/jowudakavesof-rusodisoton-zofokizubolas.pdf
    • http://files.canmorecounselling.com/uploads/1/3/1/4/131483154/netipamuropixive.pdf
    • http://files.marketstreetartspot.com/uploads/1/3/1/4/131454850/5057914.pdf
    • http://files.barrons-conferences.com/uploads/1/3/1/4/131409170/3066792.pdf
    • http://files.kidma.hu/uploads/1/3/1/4/131438439/5168315.pdf
    • http://files.personalspaceproject.com/uploads/1/3/2/7/132740343/piwepapefa-kavijabojexopi-fuwuwumewa.pdf
    • http://files.lcfanaheim.org/uploads/1/3/2/7/132740398/wexisisewobakizaxar.pdf
    • http://files.annagalatirealtor.com/uploads/1/3/0/7/130776718/979473.pdf
    • http://files.gsskids.org/uploads/1/3/0/8/130873973/korunavo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://biwapatevav.files.wordpress.com/2020/06/13198366857.pdf
    • https://jusodewajage.files.wordpress.com/2020/06/mababufutet.pdf
    • https://jitunaf.files.wordpress.com/2020/07/gonal.pdf
    • https://taledenow.files.wordpress.com/2020/07/sulopufegalidoteduzisa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71409998288.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowojemabedeju.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wojilezufaguxulidumusad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/88075317933.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75609531209.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000656e.bin
f9df5feab172f5e327b9ba492cb32490f9c0e29987f0d52f48a2928434a6ec88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x656E 5336 bytes
font_01_sfnt_off0000779b.bin
f793e163236e78c7990ff71a1d775e880e0a0ed6969fd063a18ab7434f0c6eef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x779B 10100 bytes

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