Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3c329f928ddf2b…

MALICIOUS

PDF

44.3 KB Created: 2020-08-30 04:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7a7997c00ff2881b064dff4416a7d28 SHA-1: 9d5b4783e95cb773e53397d337d1a4915b4dacd0 SHA-256: be3c329f928ddf2b6c6e761e61fa562a277aa514ceef5736378fcce785a0b15a
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and being part of a link farm. The primary malicious URL identified is https://ttraff.cc/wix?keyword=les+suites+terminale+s. The document body, though heavily obfuscated, also contains this URL, suggesting it is the intended lure. The ML classifier strongly supports the malicious nature of this PDF.

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=les+suites+terminale+s
    • https://static.usrfiles.com/ugd/b8c837_f0bb93717ae547a483ecad8353f8e0f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_905a349e35e3427d888c29e42dddf4a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_4101ed6d31234ea5a6c78f6d21b6cf85.pdf
    • https://static.usrfiles.com/ugd/e5a943_8aff4b1f37ea45f7984f5eb2e925305d.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_815facb080e549ba995226624461bd01.pdf
    • https://static.usrfiles.com/ugd/8cbfce_451f2ffc55be4d4aa4162e44bd048dd5.pdf
    • https://static.usrfiles.com/ugd/90c678_fa4f1c2937fe47d5b40d4757d4b3d1ba.pdf
    • https://static.usrfiles.com/ugd/ad2ade_a3a28bdc7db7488297c8a2cc1e22d405.pdf
    • https://static.usrfiles.com/ugd/c068f8_76ede0b4471445ad8aa322fa03c02f49.pdf
    • https://static.usrfiles.com/ugd/b8c837_f721d03694f1425494fa6545c4b64ef2.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_f214cd970d634ca69ff74da9b6ee250c.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6f01d067cf54a63b6bc79927bb47493.pdf
    • https://static.usrfiles.com/ugd/299074_dd69d3013066461cb3d5a6b4f640fe55.pdf
    • https://static.usrfiles.com/ugd/5de1df_99967d4afa7e49dbabd54a4c94d3dc00.pdf
    • https://cdn.shopify.com/s/files/1/0433/7994/9718/files/83926395659.pdf
    • https://cdn.shopify.com/s/files/1/0435/4143/0440/files/38250060837.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_off00006c46.bin
39f54d1894643797467011be959de4d3404a650e54c9bd6521e2a83d8ef00ba4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C46 4772 bytes
font_01_sfnt_off00007c61.bin
d82b56457feb890c492025542eca90f07a97798ca5ff6556208753fedab55ee0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C61 12052 bytes