Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e241abae8cfecc9…

MALICIOUS

PDF

48.1 KB Created: 2020-08-28 05:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8f0c7241d3d59ad95c6748954ea37df SHA-1: a52fcf2f20a852f9f38a957f5ea8928c1e735104 SHA-256: 0e241abae8cfecc9d746634413ce4b16bca3774baac288c16dabdb977b242131
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that leads to a redirector, suggesting an attempt to direct users to malicious content. The ML classifier and critical heuristics strongly indicate malicious intent.

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=quasi+linear+utility+functions
    • http://files.temposhop.co.uk/uploads/1/3/0/9/130969699/6a9f71509af0.pdf
    • http://files.cheersatthepier.com/uploads/1/3/2/7/132710797/2560115.pdf
    • http://files.mmjhorchestra.org/uploads/1/3/2/6/132681390/mefutolawalejorareg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44411244229.pdf
    • https://cdn.shopify.com/s/files/1/0431/0568/1557/files/87432682366.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1195/files/95298545721.pdf
    • https://cdn.shopify.com/s/files/1/0428/6529/5526/files/mulupidoniv.pdf
    • https://cdn.shopify.com/s/files/1/0431/5653/7495/files/jufalezutodenotukewifa.pdf
    • https://cdn.shopify.com/s/files/1/0437/4416/6049/files/30141946020.pdf
    • https://cdn.shopify.com/s/files/1/0433/9017/3349/files/lewebuwoguxezojanifivabez.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/13440502155.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tokon.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4256/files/79976972724.pdf
    • https://cdn.shopify.com/s/files/1/0429/7362/6524/files/dumunulup.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7095/files/3119140756.pdf
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/basovixot.pdf
    • https://cdn.shopify.com/s/files/1/0435/6240/1947/files/araketu_minha_razo_de_viver.pdf
    • https://cdn.shopify.com/s/files/1/0429/4787/0876/files/73838084760.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005edf.bin
4c6caf073882f962df6328a60f0f7a930c2bbc8a8847e8719964294d0e2c61e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDF 5036 bytes
font_01_sfnt_off00007012.bin
53967476cf0433e20e55ed2604ac44cef908d70de4b385f1515425e406e7a85e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7012 13892 bytes
font_02_sfnt_off00009cb5.bin
32a9fe959a89cb0d28ca0e30da48367e12e0b1d21bcf8dc3c912a1f3c38e7ffd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CB5 16548 bytes

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