Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc97789f50a794c4…

MALICIOUS

PDF

45.5 KB Created: 2020-09-06 20:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bea68adeba67b1e0aa81b14f6c021c47 SHA-1: 4748921a074aeb2bb9d28614a08fe0dcc82d18fb SHA-256: bc97789f50a794c4cbf07ea30b7200bf14f00a8bb37c22c988e05970fce97655
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One critical heuristic identified a direct link to a known malicious redirector at ttraff.club, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains references to the redirector URL and other benign-looking PDF links, suggesting a lure to external content.

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=jasper+reports+using+spring+boot
    • https://cdn.shopify.com/s/files/1/0434/4859/8678/files/31304042321.pdf
    • https://cdn.shopify.com/s/files/1/0433/7880/2846/files/limokabidiwinulikujod.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7002/files/30918974179.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/textbook_of_surgical_oncology.pdf
    • https://cdn.shopify.com/s/files/1/0435/5627/4339/files/super_punch_out_controls.pdf
    • https://static.usrfiles.com/ugd/83e24f_d23095a57e734ac19217a82ef37d0868.pdf
    • https://static.usrfiles.com/ugd/cbe325_683277e6939543e887ff95117f55f3ed.pdf
    • https://static.usrfiles.com/ugd/02631b_ddcd0e4c4cea4be0a6c734e9aab2770c.pdf
    • https://static.usrfiles.com/ugd/0d2908_9808e851a72b4d59ad2abc1583660a92.pdf
    • https://static.usrfiles.com/ugd/6c98bc_24dd9ef24019473d98394e5631bbed14.pdf
    • https://static.usrfiles.com/ugd/18122d_2eb4672f1a314c32ba68a618170d86ff.pdf
    • https://static.usrfiles.com/ugd/2ca09c_35c66355c32d4bc2b2689df675d90062.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_off0000668d.bin
78e5ac94a8aa771f0fcdff18cf82bbefa7746efeb70b577032a55701ae7bbf28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x668D 5084 bytes
font_01_sfnt_off000077e0.bin
a414754a51d3a6bebc5845219f967952983167c46a974dd1e316844452363e1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77E0 15844 bytes

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