Malicious PDF — malware analysis report

Static analysis result for SHA-256 10254c77afa33846…

MALICIOUS

PDF

48.2 KB Created: 2020-08-19 17:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f3ab1d7993554af9417c4c8f058ce6c SHA-1: b45a08d8ab86cd869b0da09e9dd6486bd680f6f5 SHA-256: 10254c77afa33846522dbbd74aa4253d159cb97c914b938b17961b1cd6e8da94
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, a significant portion of which point to a link farm designed to host malicious content. One prominent URL, 'https://ttraff.ru/pify?keyword=amapiano+videos+dance', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure under the guise of popular content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=amapiano+videos+dance
    • http://files.norwoodhighschool.net/uploads/1/3/0/8/130814856/ec33ef02639.pdf
    • http://files.maria-cipriano.com/uploads/1/3/2/8/132814306/kuviwupapemad.pdf
    • http://files.school.stmaryspontiac.org/uploads/1/3/0/7/130775249/pawapa.pdf
    • http://files.tekkpest.com/uploads/1/3/0/7/130775347/77d4cb.pdf
    • http://zopefaz.operation-imprezza.org/uploads/1/3/1/4/131483167/2788552.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/8171/8173/files/vonowokorinovuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/7258/4861/files/1620750443.pdf
    • https://cdn.shopify.com/s/files/1/0454/7723/2790/files/metal_gear_solid_1_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/3820/2273/files/acknowledgement_form_renovation_hdb.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6166/files/penolasapanabarinujipemu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1823/1709/files/77746484861.pdf
    • https://cdn.shopify.com/s/files/1/0440/6021/3398/files/relipupivupekujajoguvez.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a35.bin
c7719d43177d33c15d296307678e9579e547e84bbd7657b352d03e592d98ba0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A35 4848 bytes
font_01_sfnt_off00005a88.bin
5980ce8bcedb6f312b20b0293fbcd94d4166735aa182895ff19ed6531cfc140f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A88 4224 bytes
font_02_sfnt_off000069c3.bin
b4bb80ec3382135305ff17e95c0f4c4d144e1f7f5141cd1e3f1dab5c37cb48f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69C3 10784 bytes
font_03_sfnt_off00008ecb.bin
efd807f9f0fb1b51ce00766e2a66ac9ad65c7f97a9905ca35c75225664bfe32c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ECB 16676 bytes
font_04_sfnt_off0000a551.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA551 4324 bytes

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