Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d72f51c27cf212…

MALICIOUS

PDF

51.0 KB Created: 2020-08-31 01:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 360659ab3cda9ade2c3fdb8688f8afab SHA-1: dd36b03144a7b34e32bf8c253403a4d6cfde8ac4 SHA-256: f8d72f51c27cf21280b903b72a86a5b01e1eb813de8fbb000e50fc1f3fa8d647
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URL 'https://ttraff.cc/wix?keyword=pes+2018+steuerung' is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and numerous other links pointing to 'static.usrfiles.com', which are part of a link farm. This suggests the primary purpose is to lure users to malicious sites.

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=pes+2018+steuerung
    • https://static.usrfiles.com/ugd/90423f_1e594e69731b4f7ca17e65911667beef.pdf
    • https://static.usrfiles.com/ugd/7e6083_a91e1d53647143c59f91a3e5761f33d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_c12dd22edd5d4956868245e72cbc76be.pdf
    • https://static.usrfiles.com/ugd/23e9be_77f7d746121947709e41500bec0b01e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_8eb1866d71f94eedb18dda8893a49f48.pdf
    • https://static.usrfiles.com/ugd/078c79_f1f6eaed55cb441e9ccf7c5c465141de.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8aeafbef4f54d0883ca3820e25ac78c.pdf
    • https://static.usrfiles.com/ugd/15ebe2_7932c0271c8b4e5a8bf7687d28b1a371.pdf
    • https://static.usrfiles.com/ugd/850f07_2d50e7f9e22d462998d48dc0f4bd7247.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_bdaa993407224e608911f8b1526cc045.pdf
    • https://static.usrfiles.com/ugd/87a178_1291050d71234afb80c230278db9cd00.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d175c591d8d45b98a37a652e5fb167c.pdf
    • https://static.usrfiles.com/ugd/a43ec6_af11cf9ff5044a3c825525625751515d.pdf
    • https://static.usrfiles.com/ugd/0c41e7_90c3f1073b9242d9988488c58ba4a046.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_off00007839.bin
b64b58359310b2087c72e68c1088b8e632b6bd1d2e073327eb9852fbd49b496d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7839 4856 bytes
font_01_sfnt_off000088c4.bin
4793a7053a5436e11e746ffa8ec09e05fb65faccab4a0dbd8c041fd84af0269e
pdf-font-stream PDF embedded font (sfnt) at offset 0x88C4 11744 bytes
font_02_sfnt_off0000af51.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF51 4324 bytes