Malicious PDF — malware analysis report

Static analysis result for SHA-256 6441fc145855e8dd…

MALICIOUS

PDF

41.5 KB Created: 2020-08-11 21:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cb49dac3039f194edc6f6070baac8c1 SHA-1: d264a648e5274fca72be5516f8ca65d8b90b9ef8 SHA-256: 6441fc145855e8ddb672d9964cc9c521f681acd688cb55a5a4ee0c75221ee55a
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to harmful content. The document also features a large number of external PDF links, suggesting a link farm or SEO manipulation tactic to obscure the malicious intent. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/pify?keyword=brentwood+academy+lawsuit+pdf
    • http://files.treshijos.com/uploads/1/3/1/3/131382092/8761357.pdf
    • http://files.creatricity.net/uploads/1/3/2/6/132683400/3d7f1441a77.pdf
    • http://files.shoalhavenhighschoollibrary.com/uploads/1/3/1/4/131438392/8bc96e1a3b194b3.pdf
    • http:///www.nashvillepost.com/education
    • http:///www.nashvillepost.com/business/education/article/article/20447332/us-
    • http:///www.nashvillepost.com/business/education/article/article/20447332/us-supreme
    • http:///\/www.nashvillepost.com\/business\/education\/article\/20447332\/us-supreme-courts-54-ruling-favors-brentwood-academy,requestQs
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/rarinubejonupusivupuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0258/4480/files/undo_a_commit_github.pdf
    • https://cdn.shopify.com/s/files/1/0434/7763/1126/files/mijikuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/4831/2730/files/nc_dmv_permit_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/5038/5051/files/24626792277.pdf
    • https://cdn.shopify.com/s/files/1/0432/2190/9662/files/how_to_run_minecraft_as_administrator.pdf
    • https://cdn.shopify.com/s/files/1/0428/7630/5564/files/fugelosabevexaze.pdf
    • https://cdn.shopify.com/s/files/1/0431/1918/1978/files/dijogurep.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/51606576902.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_off0000572b.bin
c1e02fb51c24e1c31bf258eb275f13297a654e09319f7709009662e801f78cfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x572B 5544 bytes
font_01_sfnt_off00006a07.bin
64a74a485cccc6887a2c4e76714dd7a07fea5feb8931c3effe98ae6a1ddd73b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A07 15208 bytes

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