Malicious PDF — malware analysis report

Static analysis result for SHA-256 b369fdcac489e4ff…

MALICIOUS

PDF

42.9 KB Created: 2020-08-18 18:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f16afc3612c7f61cb75f69e4c2d06ecd SHA-1: f08912bbdfe26addfb92d0c06a5fbcdc5aa6f9bc SHA-256: b369fdcac489e4ff9b85f3967fc9d948b37bfb9c2bb997ea171b25d84cf4bae8
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=books++for+pc', which is a critical heuristic finding. This indicates the document's purpose is to redirect users to malicious content, likely for further exploitation or phishing. No scripts were extracted from this sample.

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=books++for+pc
    • http://napujajit.amandakristinephotography.com/uploads/1/3/2/6/132696414/edaacb5.pdf
    • http://redes.northernirelandteacher.com/uploads/1/3/0/8/130814017/4773031.pdf
    • http://wefup.thesharpeningstone.com/uploads/1/3/1/4/131407148/nurosom.pdf
    • http://gusel.alleghenybuilders.com/uploads/1/3/1/3/131380600/1621865.pdf
    • http://rufukuke.broydeblog.net/uploads/1/3/1/3/131383544/9061396.pdf
    • https://cdn.shopify.com/s/files/1/0432/3953/8851/files/jutukekerogemopo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5372/files/gunbreaker_materia_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/6418/8312/files/menaviwevewesojojisives.pdf
    • https://cdn.shopify.com/s/files/1/0432/7486/2758/files/rufanab.pdf
    • https://cdn.shopify.com/s/files/1/0437/5543/8241/files/adyashanti_books.pdf
    • https://cdn.shopify.com/s/files/1/0432/1945/2063/files/50436024269.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nojigepinipefonumupitos.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/ereading_worksheets_author_s_purpose.pdf
    • https://cdn.shopify.com/s/files/1/0437/4321/5767/files/potusorazegonalaxapen.pdf
    • https://cdn.shopify.com/s/files/1/0433/6009/2315/files/how_to_plot_a_function_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0436/2305/5523/files/apks_like_deezloader.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/21761523648.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/95183652863.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/
    • https://cdn.shopify.com

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a59.bin
5b475a96616f4f889b1261fe86e21ad8fd0e49647ac71403aa6ef40ba0d894ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A59 4880 bytes
font_01_sfnt_off00007b0b.bin
53547bf8ad400d507379bbf61c8030aa15b63d17ec4b95f401de18b1c530cae0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0B 10388 bytes

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