Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef16fecabcd1c3e8…

MALICIOUS

PDF

41.7 KB Created: 2020-09-13 17:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2fd3d2d89f6795495c6dd0e2c2da6f7 SHA-1: 5930ccea957650ce9c75a88a2a06b19e81e31d2b SHA-256: ef16fecabcd1c3e853d2836c451abc444cf568018c839f0cc22455ce9aebb19b
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The primary malicious URL identified is https://ttraff.club/wix?keyword=watch+sing+online+free+english, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL, suggesting an attempt to lure users to external content. The ML classifier also strongly indicated maliciousness.

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.
  • 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.
  • 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.club/wix?keyword=watch+sing+online+free+english
    • http://soseniwe.lifetimeepoxyfloors.com/uploads/1/3/0/7/130776321/0fb88f3881.pdf
    • http://lawufu.shadowcreekchoir.com/uploads/1/3/1/3/131381762/056378c.pdf
    • http://suderuf.caloosatrace.com/uploads/1/3/0/9/130969707/jigirawutixifikibab.pdf
    • https://static.usrfiles.com/ugd/6a7407_0fed0ba75bb541e5b4448c8c5f0a9968.pdf
    • https://static.usrfiles.com/ugd/1be480_6455d9dd8cd34e56b3bd9d57ef401fbe.pdf
    • https://static.usrfiles.com/ugd/08e331_16d6a6d9b63f4152b465119e544e0042.pdf
    • https://static.usrfiles.com/ugd/edb4a7_e28d31b07eb84a3da710d3f7c84575cc.pdf
    • https://cdn.shopify.com/s/files/1/0434/1855/0430/files/wubifigi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5644/7136/files/46761705744.pdf
    • https://cdn.shopify.com/s/files/1/0430/2376/1571/files/cats_in_the_cradle_cat_stevens.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/22583490271.pdf
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/22469273175.pdf
    • https://cdn.shopify.com/s/files/1/0434/4102/9276/files/zadam.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/blank_australia_political_map.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_off0000651b.bin
d9dc6f9fec4e83b07efefcde8ad5f8b4e3eca0c93c0a596afbef68b5bfb98f59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x651B 5156 bytes
font_01_sfnt_off000076b0.bin
7deee51d76721af399da2b56edcdc848d28f0e369b288c35d09ba294831545ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B0 10420 bytes

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