Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9e51fabf4bb2c6…

MALICIOUS

PDF

40.4 KB Created: 2020-08-29 20:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b702af57427ee283f02cc29b44d48d0 SHA-1: 1a464733a9363081264785b8ea42b353f98cffb6 SHA-256: 3d9e51fabf4bb2c6f78aed8d02c65d915be516282461c163a59f65ae08daa404
92 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL 'https://ttraff.ru/wix?keyword=ispring+free+cam+8' is the primary indicator of malicious intent. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains this URL, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/wix?keyword=ispring+free+cam+8
    • https://static.usrfiles.com/ugd/b8c837_eea4112683c54a28bbe9606a482bf2ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_15216b0e15844e7fbff76eea20b523a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbd68313aa79451b801647f1eb970551.pdf
    • https://static.usrfiles.com/ugd/d54300_7b882fdd8b4142269f31a3af94cadab7.pdf
    • https://cdn.shopify.com/s/files/1/0437/5596/2522/files/hey_raam_hey_ram.pdf
    • https://cdn.shopify.com/s/files/1/0439/3759/5560/files/84611418603.pdf
    • https://cdn.shopify.com/s/files/1/0434/6812/8422/files/53945180567.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3357/files/xegilew.pdf
    • https://cdn.shopify.com/s/files/1/0430/0367/4785/files/titowoxigo.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_off00005c9c.bin
eb60b97fb5951f7cb2fcc54d70fe293e603944467e794f0523c6ab7461695a6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C9C 5432 bytes
font_01_sfnt_off00006efe.bin
1ec617a64eedc30db55ec3e7843736b35942a9840f3c79ae85e12c735107175a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFE 11964 bytes

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