Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c1c91d1828639e…

MALICIOUS

PDF

59.2 KB Created: 2020-08-29 17:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a3b240aaf25b756195f2e5f6c2da30d SHA-1: 4789eadb20aa754f1eca8ad838ef1a6773bf94f8 SHA-256: 43c1c91d1828639e82d76c9eacd7ae0c3ea2493fa85f9d989bff69d70b013bf3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The embedded URL 'https://ttraff.cc/wix?keyword=acordes+del+canto+un+mandamiento+nuevo' is the primary indicator of malicious intent, likely serving as a lure to a phishing or malware distribution site. The document body, though heavily obfuscated, contains this URL, reinforcing its role in the attack.

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=acordes+del+canto+un+mandamiento+nuevo
    • https://static.usrfiles.co
    • https://static.usrfiles.com/ugd/b8c837_83f302add91a4c388bac6195e9b3652f.pdf
    • https://static.usrfiles.com/ugd/b8c837_111f842161c24db69370aa173d83e0fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c89821c0d3b47179eb2d5a74a5db638.pdf
    • https://static.usrfiles.com/ugd/856cea_39ac06ad424141ee9d56e6f5e0c746a9.pdf
    • https://static.usrfiles.com/ugd/0c268c_6aab4df0327b405582a697a93ad79515.pdf
    • https://cdn.shopify.com/s/files/1/0434/8598/6982/files/baudelaire_poems.pdf
    • https://cdn.shopify.com/s/files/1/0437/0916/9815/files/le_journal_el_khabar.pdf
    • https://cdn.shopify.com/s/files/1/0434/0930/9854/files/weather_report_buxton_uk.pdf
    • https://cdn.shopify.com/s/files/1/0437/9446/4929/files/formation_agent_d_escale_aeroportuaire_bordeaux.pdf
    • https://cdn.shopify.com/s/files/1/0458/1693/8662/files/56002213738.pdf
    • https://cdn.shopify.com/s/files/1/0432/1188/2653/files/57809667447.pdf
    • https://cdn.shopify.com/s/files/1/0431/1554/4737/files/tazelaxiwode.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3636/files/vb_net_case_statement.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d8d.bin
3702ca422c5d2c4c1dedb90cb7c9625781c18023cd9c0c22c14106f743acefbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8D 5016 bytes
font_01_sfnt_off00009e74.bin
29b7f51248cdc4df489f72c157f19ed1832b9b1106dd5bf5491991b2570c138d
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E74 16392 bytes
font_02_sfnt_off0000cfd5.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD5 4324 bytes