Malicious PDF — malware analysis report

Static analysis result for SHA-256 235f4088b7034ac3…

MALICIOUS

PDF

42.9 KB Created: 2020-08-30 21:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a18b9dd7e0a5a88ca9de7842c338ba02 SHA-1: 470495eb771713261a708c2c74101c139d747ebe SHA-256: 235f4088b7034ac38cbbb6edbd1408d5e7a8b79113b8ad205618da4d4f46dd62
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, identified as a PDF link farm. One of these links, https://ttraff.com/wix?keyword=skyrim+set+carry+weight, points to known malicious redirector infrastructure. The presence of this malicious redirector, combined with the ML classifier flagging the PDF as malicious, strongly suggests an intent to lure users to harmful sites. The document body contains garbled text and a URL, further supporting the malicious nature.

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.com/wix?keyword=skyrim+set+carry+weight
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/miwumavonurorusu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2725/0848/files/59148919789.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8190/files/55763168973.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76957488457.pdf
    • https://cdn.shopify.com/s/files/1/0437/2014/7095/files/tekemukatelerubu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4245/files/ti-_89_titanium_manual.pdf
    • https://static.usrfiles.com/ugd/b8c837_259237dfbc5c4eaab657fb1e0700b98d.pdf
    • https://static.usrfiles.com/ugd/77eba6_a5e9c30d69934f819acb450ca961cceb.pdf
    • https://static.usrfiles.com/ugd/f63f29_e59b37aa8c364b26a8b060e623e2afa8.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0f54ddade5444de8b3c5eb5b60fc309.pdf
    • https://cdn.shopify.com/s/files/1/0438/6720/9893/files/bams_full_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0435/4162/7029/files/antenna_theory_analysis_and_design_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d10.bin
cdcfb633d5304dba22bccfa69477dceaaacce702309da3baf3ed7a8f64a62990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D10 5116 bytes
font_01_sfnt_off00006e84.bin
ed0e3a9ed11c1417499f1c34907b8309811e3de25938efdb75e58367ffe875c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E84 10304 bytes
font_02_sfnt_off0000910e.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x910E 4324 bytes

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