Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9661c37e42d2b66…

MALICIOUS

PDF

44.8 KB Created: 2020-09-17 06:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ff120192c30248c3c7a935497a2075f SHA-1: a30292b9051567ea303c8364da03815d84dbf650 SHA-256: a9661c37e42d2b66712dc291ff0adf4dd5a15dd191736e23268cc11cd8653386
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as a business plan, intended to lure users to a malicious site. The ML classifier strongly indicated maliciousness. The document body contains obfuscated text and multiple embedded URLs that point to link farms, suggesting a phishing or malware distribution 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.link/wix?keyword=business+plan+of+fish+farming+pdf
    • http://files.charlottespurpose.com/uploads/1/3/2/6/132695574/6425839.pdf
    • http://kapenatem.ketikotitafel.nl/uploads/1/3/0/8/130873822/dewexurovatafo.pdf
    • http://files.cosroscoe.org/uploads/1/3/1/3/131379485/2556852.pdf
    • http://files.admcclub.com/uploads/1/3/0/8/130813120/ed39dfa7f46a5b.pdf
    • http://files.colorfulstrokesca.com/uploads/1/3/1/4/131454216/revobuve_jiwuratazerijig.pdf
    • http://jewaraso.d-aleksandar.com/uploads/1/3/1/8/131856072/7fe695da2346.pdf
    • http://gamusuf.generatoronlinestore.com/uploads/1/3/0/7/130740537/xuwuv-judejisegis.pdf
    • http://nidode.docksideengraving.com/uploads/1/3/1/4/131483128/balufiravumawu.pdf
    • http://vagina.mtnexperiences.co.uk/uploads/1/3/2/6/132682859/701237db761.pdf
    • https://53f4b50f-7559-455e-b176-518cc22d645f.filesusr.com/ugd/dc8a8e_59c6a597460b46a2aa6a38c23ecc1b00.pdf?index=true
    • https://17617a6f-ae5c-4ca3-b394-edb324eb69b1.filesusr.com/ugd/904a8b_d91dbf21bf2c4ba2a89c587ceb982303.pdf?index=true
    • https://148c3382-cd48-4444-a9a0-9f31c451826b.filesusr.com/ugd/29c71c_70c5fce5772541099b9eefcd735a34ee.pdf?index=true
    • https://d6b2262d-512b-4796-acfa-d445260a625c.filesusr.com/ugd/9ff9b8_427e055daee54b7fa822d1e214e2e345.pdf?index=true
    • https://6b8c0455-48c3-43d5-baf2-6a259e73210d.filesusr.com/ugd/d8966e_8adfb35cce85433eb1ed39c3cc82eb61.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/9238210735.pdf
    • https://cdn.shopify.com/s/files/1/0433/6100/9829/files/descargar_juegos_de_mesa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wifufokamavobopizevotug.pdf
    • https://cdn.shopify.com/s/files/1/0437/7932/6103/files/11244573201.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007082.bin
c0fa87ca5df304ec86368c46a8064c85a843de3bc74734be019a63998680050b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7082 5504 bytes
font_01_sfnt_off00008315.bin
6f1a8bcff49ddf668b27ba1f23034cecfa101e6594cfd6a7dad753d1b68c6f9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8315 10184 bytes

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