Malicious PDF — malware analysis report

Static analysis result for SHA-256 087aa5fe67500944…

MALICIOUS

PDF

47.3 KB Created: 2020-07-30 03:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 479af2f8f0f240d55f123fc859ea5fc5 SHA-1: f8f5cab13872c02f1b5eaca8072b47db75c0112e SHA-256: 087aa5fe675009443a8362f550b942ce099dcf7573af3419d3bc87aecdb90c6d
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with one prominent link pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of many outbound links suggests an attempt to distribute further malicious content or engage in SEO spam. The document body, though heavily obfuscated, contains text related to a 'digital marketing agency proposal', which is likely a lure.

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.com/pify?keyword=digital+marketing+agency+proposal+pdf
    • http://files.greenwithenvyintdec.net/uploads/1/3/1/6/131606011/924c8e623b5.pdf
    • http://files.aguadulce-countryfair.com/uploads/1/3/1/4/131453255/b985bcbace.pdf
    • http://files.ciarchitect.com/uploads/1/3/0/7/130739811/sulowisozidegeremo.pdf
    • http://files.bishophillcolonystoreb.com/uploads/1/3/1/3/131378868/6973349.pdf
    • http://files.myhoosierhearth.com/uploads/1/3/2/6/132681670/11c0aece2afb992.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2123/6384/files/44545489104.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0810/files/47745928145.pdf
    • https://cdn.shopify.com/s/files/1/0434/5754/4342/files/ginoram.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/xexukorezifanuxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9118/9157/files/kejeniwovezijego.pdf
    • https://cdn.shopify.com/s/files/1/0440/8256/1176/files/82242037388.pdf
    • https://cdn.shopify.com/s/files/1/0437/1821/3797/files/xujimog.pdf
    • https://cdn.shopify.com/s/files/1/0436/3694/9152/files/zazufamerak.pdf
    • https://cdn.shopify.com/s/files/1/0428/7650/2182/files/wijaze.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5080/files/morodof.pdf
    • https://cdn.shopify.com/s/files/1/0434/5410/3713/files/nisabotozanud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luvibuxunefipefijuli.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/rikujilowoxupiwadibe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7115/2023/files/6445968534.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_off00007a82.bin
5de27f7b050af6355fd78ec692126d5caf8812f75419c80a48cda30e795ad955		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A82 5428 bytes
font_01_sfnt_off00008ce9.bin
94d0961c0582fc49667438eb3cecfda4ae0615b1f40e5f06a6239677d3d4c3c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE9 10236 bytes

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