Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ca5d32df77945b…

MALICIOUS

PDF

42.7 KB Created: 2020-08-30 18:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a91af4fdad101a1d33b79d86331343c SHA-1: c5b45ca0e5327c7a5289f5bf5b533e28b21643e8 SHA-256: 67ca5d32df77945bb8ece5b5855b8fbfd3c4763c991508451feda4eedade3633
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector. The document body is heavily obfuscated and appears to contain encoded text, but the primary malicious indicator is the redirector URL. The presence of multiple embedded links, some pointing to benign Shopify URLs and others to the redirector, suggests a link farm or phishing attempt.

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.com/wix?keyword=%25D0%25B0%25D0%25BD%25D0%25B3%25D0%25BB%25D0%25B8%25D0%25B9%25D1%2581%25D0%25BA%25D0%25B8%25D0%25B9+%25D0%25B0%25D0%25BB%25D1%2584%25D0%25B0%25D0%25B2%25D0%25B8%25D1%2582+%25D1%2581%25D0%25B2%25D0%25BE%25D0%25B8%25D0%25BC%25D0%25B8+%25D1%2580%25D1%2583%25D0%25BA%25D0%25B0%25D0%25BC%25D0%25B8+2+%25D0%25BA
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2269/6096/files/juzezusipur.pdf
    • https://cdn.shopify.com/s/files/1/0429/6530/3455/files/gujakekowuwitowiwaze.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/buribopajevojiw.pdf
    • https://static.usrfiles.com/ugd/1f2646_0ee7aeb44da74eca8eb5fa04342b5374.pdf
    • https://static.usrfiles.com/ugd/cafc24_b4ace4769c944fa0873b0fd707932412.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a646338c86f4a83885676201460208a.pdf
    • https://static.usrfiles.com/ugd/850f07_274168cb996d4e0b887c0ff8ecfa694c.pdf
    • https://static.usrfiles.com/ugd/824332_89f107411b924bfea78dd82dcd67240b.pdf
    • https://static.usrfiles.com/ugd/8d57bd_2e4806aa4b2647c3833a8581bfddfc65.pdf
    • https://static.usrfiles.com/ugd/ea78e0_4961f50ef47e447ea7b53c97e7a518e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2f96d5e319c4ed686aed994d590cb72.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_off000058d9.bin
d6a10b525384ecdc34e3028a46b345d926f2575a11d7b52e301d7b7448442a21
pdf-font-stream PDF embedded font (sfnt) at offset 0x58D9 5932 bytes
font_01_sfnt_off00006cb5.bin
19bf2dcb7b0dcf022fa2342103fce6303dc64b82342bd75b48e76ac6028933ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB5 15244 bytes