Malicious PDF — malware analysis report

Static analysis result for SHA-256 8957c67801cbb25a…

MALICIOUS

PDF

44.4 KB Created: 2020-09-06 21:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3138c2f2f664dd1d33e9693a8e404e26 SHA-1: 13aee184341bb7cdb19f6bf9398b6621752a791c SHA-256: 8957c67801cbb25a31561787912a3911a11f866a9543ae50662eac9348a59cb1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'wordpress delete page template' and the redirector URL. The presence of numerous external PDF links, many benign, suggests a link farm or SEO manipulation tactic to distribute the malicious redirector.

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.link/wix?keyword=wordpress+delete+page+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/f1d680_045e25c533604756b16c87aba864bc44.pdf
    • https://static.usrfiles.com/ugd/26938b_e0ef6dbff0c149faa1fdd8db910a80e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad6d2c485c094095bf5fe1d150aad627.pdf
    • https://static.usrfiles.com/ugd/97634b_7e02d5b49daf408d9228700aab6abe72.pdf
    • https://cdn.shopify.com/s/files/1/0439/2439/0056/files/zibuzulesikibotufapif.pdf
    • https://cdn.shopify.com/s/files/1/0433/9482/6396/files/nakama_2_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0439/3569/5016/files/biblio_scientifique.pdf
    • https://cdn.shopify.com/s/files/1/0432/3557/3919/files/kipibinikuwesibinate.pdf
    • https://cdn.shopify.com/s/files/1/0434/3450/8455/files/88316438538.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/1743310965.pdf
    • https://static.usrfiles.com/ugd/83f04e_208f13ade0c441e1ae143c74c268f2b4.pdf
    • https://static.usrfiles.com/ugd/b7306e_c2363eefb0f348569e4f202f69e39203.pdf
    • https://static.usrfiles.com/ugd/b6aaa0_e8d3f008110f4300a4de9afb522646c5.pdf
    • https://static.usrfiles.com/ugd/8b2c09_d3d1eae2b95a4ac88ef04f4d5f2ec9dd.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_off00006f29.bin
efc75536377f7abb132956bfe8fb4988334300fbb040086ee9e20125e3befabc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F29 5292 bytes
font_01_sfnt_off00008121.bin
378ae111b4afc4610daad2e37bab85fdaae22d2e01cf0eed3a63846258e5032b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8121 10516 bytes