Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a189554141284a3…

MALICIOUS

PDF

44.7 KB Created: 2020-08-02 19:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e42bc9bdccd19bdf0ede33282c099dfc SHA-1: d6ce0c8855419cdfec2dd6d9e73943acedad86bf SHA-256: 9a189554141284a36732d5800d7f6ed24978b8a6b1199139279588f1e5a7902f
154 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to a malicious URL, disguised as a vocabulary worksheet. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to known malicious infrastructure. The ML_NYX_PDF_MALICIOUS heuristic indicates a high probability of maliciousness. The document body, though heavily obfuscated, contains the target URL and appears to be a lure for users to click on it.

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/wb?keyword=post%20classical%20civilizations%20vocabulary%20worksheet
    • http://files.sleddogsocietyofwales.co.uk/uploads/1/3/0/7/130776148/3e01856e2ed9.pdf
    • http://files.laketenkiller.com/uploads/1/3/1/4/131407823/9363337.pdf
    • http://files.misfitcrusaders.com/uploads/1/3/0/8/130814672/634f8e.pdf
    • http://files.pousadavillaverde.com/uploads/1/3/1/4/131452922/batifepa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9459/8047/files/vewuvegeridi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1674/1286/files/wodibema.pdf
    • https://cdn.shopify.com/s/files/1/0432/1237/4174/files/8412195917.pdf
    • https://cdn.shopify.com/s/files/1/0433/0881/0398/files/miwaxovojudovaluwiku.pdf
    • https://cdn.shopify.com/s/files/1/0432/0103/6443/files/lilenafurepuwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/1435/7145/files/lefudik.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0951/files/48370660720.pdf
    • https://cdn.shopify.com/s/files/1/0433/3928/4645/files/lezexupedizuzokevujilal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90278046640.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/76940320216.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5754/files/20915893075.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2678/files/42393457876.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/somatalube.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2346/files/norubavusazuvavu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7595/2030/files/gisaninon.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_off000070ac.bin
0338cff2fbf167c5efdc3f966fcc53286ea74222b6809f6c6f83edd0cf61723b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70AC 5396 bytes
font_01_sfnt_off00008327.bin
d22bbd2d17eede40b583944998e74787771945cbd23d1ec246d029aa0021a3ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8327 10008 bytes

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