Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a74bccd8fa84779…

MALICIOUS

PDF

59.0 KB Created: 2020-08-09 01:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1056c5f67e5b9a89cbf4e31377eda343 SHA-1: fbbbb50d3547b1c3cb60205caa8f312b6191afdf SHA-256: 8a74bccd8fa84779dde7c5d892b8074ff11c0f25285b37d7f9939879892bbef8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a helpful tool for merging PDF files. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic fired, pointing to the URL https://ttraff.cc/pify?keyword=unir+varios+pdf+en+uno+con+photoshop. This suggests the document's primary purpose is to redirect users to malicious infrastructure.

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.cc/pify?keyword=unir+varios+pdf+en+uno+con+photoshop
    • http://fekuxoze.riverdeltaresort.com/uploads/1/3/2/6/132682883/5743855.pdf
    • http://files.chriswarrendickins.com/uploads/1/3/1/3/131380625/c12fc1a7.pdf
    • http://files.watercolorsbylana.com/uploads/1/3/1/4/131482819/rofimowadima_lowifum_kijotisedinu_dunikibi.pdf
    • http://files.shepherdscott.com/uploads/1/3/0/9/130969545/7590613.pdf
    • https://cdn.shopify.com/s/files/1/0430/1130/9719/files/94267939228.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98908457197.pdf
    • https://cdn.shopify.com/s/files/1/0429/5137/7049/files/xatugofuzigodixolifo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/dixivarolepep.pdf
    • https://cdn.shopify.com/s/files/1/0434/5528/3367/files/26639749217.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3672/files/26523716859.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kiwovanigefuminif.pdf
    • https://cdn.shopify.com/s/files/1/0434/0485/3406/files/modugizefe.pdf
    • https://cdn.shopify.com/s/files/1/0438/1753/3597/files/edgar_alan_poe_libros.pdf
    • https://cdn.shopify.com/s/files/1/0431/0394/4853/files/sovuvif.pdf
    • https://cdn.shopify.com/s/files/1/0439/7917/8142/files/administracion_estrategica_de_recursos_humanos.pdf
    • https://cdn.shopify.com/s/files/1/0432/2036/9567/files/tekabetemed.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d62.bin
959386ed88b44de17fd673df84d92bfe902a0ef8ecadf0185765bc6f96cfc48d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D62 5144 bytes
font_01_sfnt_off00009edd.bin
7cd51e5adf4dd2e2c70b32f38590dc0b3d8450d1e9d35e78681b22ed7c45fa93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EDD 15920 bytes
font_02_sfnt_off0000cf6e.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6E 4324 bytes

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