Malicious PDF — malware analysis report

Static analysis result for SHA-256 0510b4ef9b99abd4…

MALICIOUS

PDF

36.2 KB Created: 2020-09-01 20:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27c9b9d63d64089b74ec49a12743ab43 SHA-1: 6e73a7674278b8f1dece06526464b42452191ab4 SHA-256: 0510b4ef9b99abd494b3f02272957fad182cd538b35712fc4eff17243a82441e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external links, suggesting a link farm or spam campaign. The embedded URL 'https://ttraff.cc/wix?keyword=slam+book+html+template' is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, reinforcing the finding of a link farm.

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/wix?keyword=slam+book+html+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0a052f_1fbc6a4115c9466198efa59aafd91f8e.pdf
    • https://static.usrfiles.com/ugd/d216cb_53f505ae82e8452396cb8fc3af3ce87c.pdf
    • https://static.usrfiles.com/ugd/b8c837_6371cab9a18e4de4afbad73d6b44d57c.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_a97bd5143fde4e4f92e427ac22481a4d.pdf
    • https://static.usrfiles.com/ugd/18122d_2f7efa523b3b493c9eaa6674dec85a73.pdf
    • https://static.usrfiles.com/ugd/353d00_92915e9edb484bca97f57f91d9fc2293.pdf
    • https://static.usrfiles.com/ugd/73c254_e6feb1bf21514c7bac8247e6da964c2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_49125088aa2249d98fcd5d7697daa921.pdf
    • https://static.usrfiles.com/ugd/22bf55_47dcae94a72941399871d5d1b42b6c93.pdf
    • https://static.usrfiles.com/ugd/f46427_56e0563e12f24e32bf77407fef83d893.pdf
    • https://static.usrfiles.com/ugd/f515ca_f5334a69966e44c6b2ad2e33b80606fb.pdf
    • https://static.usrfiles.com/ugd/0c268c_38d22928f3f94da4836235d791df1645.pdf
    • https://static.usrfiles.com/ugd/d17951_a4fa99b226194802a393b1f92578c9f2.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/55050951714.pdf
    • https://cdn.shopify.com/s/files/1/0462/6854/7223/files/vamexadovidemasij.pdf
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/t_me_quieres_blanca.pdf
    • https://cdn.shopify.com/s/files/1/0435/9149/9935/files/53846548055.pdf
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/incident_report_example_excel.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_off00005123.bin
37a0d4fc969bb6d3906ed0128995f7192f85a9ba6f78ea6040f070cb9bc9ec09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5123 5092 bytes
font_01_sfnt_off0000624a.bin
cd370db36a778291d6292d7cbf83808862c51dc6003efe608773063fa7055027		 pdf-font-stream PDF embedded font (sfnt) at offset 0x624A 10056 bytes

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