Malicious PDF — malware analysis report

Static analysis result for SHA-256 a835d6ff5cfd6d05…

MALICIOUS

PDF

32.2 KB Created: 2020-08-30 20:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d816053b7752d8757d5f5088f9ce056 SHA-1: d867cfd8e8aab8a3a39e6b4231fdd43755f0cf00 SHA-256: a835d6ff5cfd6d0522b0d293d6e629da7349ea900ba61921ea3a611c9879b622
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to funnel users to malicious content. The document body itself contains garbled text but also includes the URL 'https://ttraff.cc/wix?keyword=montana+300+album+download', reinforcing the malicious intent. The presence of a mass external PDF link farm further suggests a spam or phishing campaign designed to drive traffic to malicious sites.

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=montana+300+album+download
    • https://static.usrfiles.com/ugd/6cf392_af9c388db1f7447fadc47c9352d4f115.pdf
    • https://static.usrfiles.com/ugd/b8c837_de1982beb60f4633a0fc9de9b3d86fd8.pdf
    • https://static.usrfiles.com/ugd/c836c3_15f2c13fdc2c40d694caeac300f90bd8.pdf
    • https://cdn.shopify.com/s/files/1/0431/6489/3344/files/jixoratub.pdf
    • https://static.usrfiles.com/ugd/b11f6d_871fdc3cf38147fc84c31a60851ada40.pdf
    • https://static.usrfiles.com/ugd/1849a1_a1996141a57a412e99dcfb077082db25.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8561b3d94fb455582ee1c7ffe737d17.pdf
    • https://static.usrfiles.com/ugd/b8c837_8041330707dd494c971443e5c356c8ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_62a5d968ecc846639d3de5cc1a6faf2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_19ee4eedaeb04954a20a3e07c9d8c732.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_off0000403a.bin
2551f824e7068d3e0ad6084c4916cbbf7cdfdbc395cba4d6c61311275aa4c82b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x403A 5240 bytes
font_01_sfnt_off0000520b.bin
c4212e4f09468ece2353d5d686de2121bd91c56ff9f116af1226202834a269b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x520B 10092 bytes

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