Malicious PDF — malware analysis report

Static analysis result for SHA-256 8728d95860719b17…

MALICIOUS

PDF

49.6 KB Created: 2020-07-30 00:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afec445bce29982f56dd8f1fe88d993a SHA-1: d916d2184772b34c10ccd08270fe0275a3b11dc8 SHA-256: 8728d95860719b174b66906052073fff1057afb31d7035e59f7bbcd039e6cd5f
158 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body appears to be obfuscated or corrupted, but the presence of a link farm and the ML classifier output strongly suggest a malicious intent to redirect users. The primary malicious IOC is the redirector URL.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/pify?keyword=amazing+grace+a+cappella+pdf
    • http://files.carrollswenson-roberts.com/uploads/1/3/0/7/130740249/jivobufem_lowujera_musom_zuwobikimofanag.pdf
    • http://files.braverthanthewaves.com/uploads/1/3/1/4/131453807/5359755.pdf
    • http://files.storygal.com/uploads/1/3/0/8/130814680/fekawopepafudaj-jefixakob-gezedajujopo.pdf
    • http://files.storygal.com/uploads/1/3/0/8/130814680
    • https://cdn.shopify.com/s/files/1/0434/5528/3350/files/lizufuriboguredokuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/82399117624.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/jexibugovofu.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5003/files/87343353573.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/4428550143.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/39361292037.pdf
    • https://cdn.shopify.com/s/files/1/0432/5641/4363/files/pitapenabapilur.pdf
    • https://cdn.shopify.com/s/files/1/0433/5920/7582/files/92957562636.pdf
    • https://cdn.shopify.com/s/files/1/0434/8638/0189/files/21208713571.pdf
    • https://cdn.shopify.com/s/files/1/0431/9140/2660/files/42727046160.pdf
    • https://cdn.shopify.com/s/files/1/0428/5464/5916/files/bavurujodojepatarubur.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/81194745586.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_off00006f08.bin
62a18cbbc8dc0c1b4a20d755559bb34ec724b44bc122cfab7b9a71f396e7b636
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F08 3292 bytes
font_01_sfnt_off00007ad8.bin
2c2562bdc33930255180c877d549bc72a55df5abe5883d3c1c599eaa66226d51
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD8 4936 bytes
font_02_sfnt_off00008b71.bin
d7f084bb0f7e08a5658093851dcfb5b2f0961ec5ffeb827317dd6ec1cbe0ced2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B71 13916 bytes