Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a8e92c346065f4…

MALICIOUS

PDF

37.8 KB Created: 2020-08-31 17:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba3990e4b9d9ceaa99a83666659666fb SHA-1: 969910fe00613bbadd8c5d6ea3cc8b978327eac5 SHA-256: f7a8e92c346065f4c02d347d9c9860dd4be8aea384a33bdd7e5c23eb0d81ece5
128 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link disguised as a medical dictionary download. The link leads to 'ttraff.cc', which is known malicious infrastructure. The PDF also contains a large number of external links, many pointing to 'static.usrfiles.com', which is likely part of a link farm to improve SEO for malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=dorland+medical+dictionary+for+pc
    • https://static.usrfiles.com/ugd/7f16bd_8b77d651679f4d89a3ed59270d617548.pdf
    • https://static.usrfiles.com/ugd/f65175_e0a31b3b190245c5b887a85dcd189280.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2aa5f7c293f40e8a49fb8af0b84d0d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4f49d37fb594763bca7091127031944.pdf
    • https://static.usrfiles.com/ugd/4479ed_ef7784d3fdfe4e7d8dfe0f2a9488b81b.pdf
    • https://static.usrfiles.com/ugd/0049ca_a60315bba1c243fa93208f918aeac1aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_012066c4100a4d72aa42819e8794940d.pdf
    • https://static.usrfiles.com/ugd/3de8a6_69da5530dfcf4983a09cb100a2f63b32.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gizuvesadumewagetikuxumut.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2051/files/3ds_max_2015_vray_plugin_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/pinox.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_off000054ce.bin
192174497be4e61fd4ae1083da9ce080064f3de244ebeefea7538dc654424093		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54CE 5224 bytes
font_01_sfnt_off00006691.bin
3afb469e12cd445816db7b24425bcf3615705f64e1f926e895dca53ed56636da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6691 10820 bytes

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