Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c832c2cb397395…

MALICIOUS

PDF

36.4 KB Created: 2020-09-04 02:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdb58fe5187c3be3dcace018ffc60d87 SHA-1: 89bb644c2815cc087ec35263441d60d19f66c3a4 SHA-256: 21c832c2cb397395ca7f7ee039d1d714b22db830657765a40ad7275cf7f7888f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends

The PDF file was flagged by a machine learning classifier with high confidence and contains a significant number of embedded links, many pointing to a redirector service. The primary malicious URL identified is https://ttraff.me/wix?keyword=anurati+regular+font+free, which is likely used to funnel users to further malicious content. The document body itself is heavily obfuscated and contains junk data, but the presence of numerous external links suggests a link farm or redirection strategy.

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.me/wix?keyword=anurati+regular+font+free
    • https://static.usrfiles.com/ugd/65b209_6e79de07d35c4f85b75c7d7d084c3228.pdf
    • https://static.usrfiles.com/ugd/6c032c_005e721c551f4ed1a93d17281af9ac41.pdf
    • https://static.usrfiles.com/ugd/b8c837_d13ebb582b0c42c48a352cca8453337e.pdf
    • https://static.usrfiles.com/ugd/6da380_488e6937858242c499fc52fed948088d.pdf
    • https://static.usrfiles.com/ugd/38eac1_fb6937773a354ba298fa47b00ba4b59d.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8032/files/anti_mosquito_killer_sound_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/7401/0782/files/c_open_in_new_browser_window.pdf
    • https://cdn.shopify.com/s/files/1/0433/7251/1386/files/sesinawibeduxug.pdf
    • https://static.usrfiles.com/ugd/5360f8_82d195f12637466a86619a8746bf1c2a.pdf
    • https://static.usrfiles.com/ugd/be19e1_536cca513f2b43c6a5d235f062461709.pdf
    • https://static.usrfiles.com/ugd/bf650e_98e831dfa51d4df18518a09ac259e2fe.pdf
    • https://static.usrfiles.com/ugd/e73fea_faa36bfea15e4392ad786c4756baf2d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d59396c198f4cf39d4cf8d6817daf74.pdf
    • https://static.usrfiles.com/ugd/268ab1_3a3c748ef85b4b6980b06286e346db61.pdf
    • https://static.usrfiles.com/ugd/e32576_cbaa216c4ca140079168e64e952b5d4c.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_off0000534b.bin
2ab7da86bc7032fcf6b181a587f6c0f1921b1546555ab1abd4d3576bc4d3b7be
pdf-font-stream PDF embedded font (sfnt) at offset 0x534B 4744 bytes
font_01_sfnt_off0000637e.bin
9cd377403671dad04dac79c330b3ac20b13de4de4dd8ba926cf3aec080af496d
pdf-font-stream PDF embedded font (sfnt) at offset 0x637E 9880 bytes