Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdfca8e0961b710…

MALICIOUS

PDF

42.3 KB Created: 2020-08-31 04:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5e2473e03c13c53700ce89b0c16d5bd SHA-1: ed864db855bc86c05b21c828adf7ee25f5e4903d SHA-256: 6bdfca8e0961b710d6504cf514c3459a77674f4ba962100d8713a4064500b4c6
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=proximity+sensor+nedir'. Additionally, it features a link farm with numerous external PDF links, suggesting an attempt to distribute content or lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs and redirector link are the primary indicators of malicious intent.

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=proximity+sensor+nedir
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b5472a_9c22a391251e4cf98eb81a5603dc9e5b.pdf
    • https://static.usrfiles.com/ugd/b3bc21_b2e14369b650464a9b3f7c95e90f45c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_39819be299b749e4a93c58badf226a85.pdf
    • https://static.usrfiles.com/ugd/67e251_d6ad87c7a05d46eeb5dfa69c26ea16b3.pdf
    • https://static.usrfiles.com/ugd/5b9a87_7e5fec06aa744932aeaff864ab4d7c48.pdf
    • https://cdn.shopify.com/s/files/1/0433/9744/7836/files/17891910764.pdf
    • https://static.usrfiles.com/ugd/b58d21_265a616f5aed464fab12eae37c768d76.pdf
    • https://static.usrfiles.com/ugd/98e298_b87aa0f8205940058b992e459524a7bc.pdf
    • https://static.usrfiles.com/ugd/191a6d_c89dd1c2d3984db0ae1bc239d870d33a.pdf
    • https://static.usrfiles.com/ugd/0c268c_b88f6deb60ef4426a32223220e8b88a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6b220cd9027416581aa06a027d7ee98.pdf
    • https://static.usrfiles.com/ugd/b8c837_44b0347737ab4394b3e02defa38c2303.pdf
    • https://static.usrfiles.com/ugd/6908d7_1b6c996cbca94c03a2fb1b4fe6b5537a.pdf
    • https://static.usrfiles.com/ugd/1f2646_b3dec61988434650bd2d64951971049c.pdf
    • https://static.usrfiles.com/ugd/b8c837_e21ebc83e53545c0992db7a8490f7f50.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_off000069e1.bin
1601a6cce121e53617300b713407ec58a8406ad28ba5b1824dca88620b7bd165
pdf-font-stream PDF embedded font (sfnt) at offset 0x69E1 4900 bytes
font_01_sfnt_off00007a7b.bin
fe0aaa522e8938b575f81892c874c670e700ef42c7c74533b58534366ba88c1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7B 10180 bytes