Malicious PDF — malware analysis report

Static analysis result for SHA-256 093e5935cc7d8d24…

MALICIOUS

PDF

45.5 KB Created: 2020-09-07 04:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8b3fe36b130296ac22c636b72d2bb10 SHA-1: 2559bd8879548f6b0f8deddeb1b5dbc970fb5865 SHA-256: 093e5935cc7d8d245679e7ee1ec0daf1b95b626ec7a991d6540833647bd75c89
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the document with high confidence. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm, suggesting an attempt to drive traffic to potentially malicious sites.

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=google+sheets+if+and+statement
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/4b7290_ba47be3feabc432cbd16afe063d99997.pdf
    • https://static.usrfiles.com/ugd/b5472a_8682f23d66c24f448c299c037351962b.pdf
    • https://static.usrfiles.com/ugd/cc03df_5b58fbb85aa845b48355c076172aab5e.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/kotenexarodoto.pdf
    • https://cdn.shopify.com/s/files/1/0435/3461/4688/files/81602931300.pdf
    • https://cdn.shopify.com/s/files/1/0428/6365/7119/files/zovawalofevowavigipufim.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/pdf_viewer_for_canadian_visa.pdf
    • https://cdn.shopify.com/s/files/1/0436/0319/8114/files/nikigefubotobadakaradiv.pdf
    • https://static.usrfiles.com/ugd/07ef24_12ab718c7b4e4c5ebd2e02a0ddaa8a59.pdf
    • https://static.usrfiles.com/ugd/4c3d6a_8b20bcfee2684b8bbb4c485113e17f2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_31ab62e2ed9c4746bce29bbd0a9a6965.pdf
    • https://static.usrfiles.com/ugd/81b904_89e6b40a81a749d3a8a7d6e0aa2fcff7.pdf
    • https://static.usrfiles.com/ugd/d94ae5_9de9874f7e374e95b24cd4135db244e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_718112393d10499fa00cf093d24a1762.pdf
    • https://static.usrfiles.com/ugd/2c8d66_7d7f6e97aac54b50bc4bf05d6ffef959.pdf
    • https://static.usrfiles.com/ugd/122077_fd0e7f4262f545c7a395a8084faee45b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000664e.bin
3ce191c46bed56aa615a56b493cff6d08a1f8d8a968b773c7aabb00a2dfedb2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x664E 3840 bytes
font_01_sfnt_off000073fb.bin
8d3a20585f1d5a33fd88a9c67e8b778a1769c02da0e44b18459355d9246c8cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FB 5256 bytes
font_02_sfnt_off000085c0.bin
85ab5a4ddb9c53e4fc17b115369fbc72dd2364d21567a1b68721a92258074670		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85C0 10156 bytes

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