Malicious PDF — malware analysis report

Static analysis result for SHA-256 17cca1b427f56a73…

MALICIOUS

PDF

52.3 KB Created: 2020-09-07 01:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8de27cf5a0586d6af690c125e9a8697c SHA-1: f3567801d925756369a47f9cf432e5dd4a5222c9 SHA-256: 17cca1b427f56a73c56b48939012f648a49cd96bbf4d424bba822aa0aac47933
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, which is likely intended to lead the user to a malicious download or phishing page. The document body, though heavily obfuscated, contains text that appears to be a lure for 'Corona renderer 1.7 full'. The presence of numerous embedded links, many pointing to external PDFs, suggests a link farm or redirection strategy. No scripts were extracted from this sample.

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.me/wix?keyword=corona+renderer+1.+7+full
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/2f7815_4c8d7ccfed044833b637c82886faada5.pdf
    • https://static.usrfiles.com/ugd/7e84b7_e3f29b16a7034abd88a139cfa3018318.pdf
    • https://static.usrfiles.com/ugd/0c268c_9b15742370c64a05b63e44bc9a593683.pdf
    • https://static.usrfiles.com/ugd/fef373_c132858e055f42c7a5cabea6d7446bc1.pdf
    • https://static.usrfiles.com/ugd/a298ce_448ae8a7f5b041cd8a278ea962748a2f.pdf
    • https://static.usrfiles.com/ugd/e80f4c_bdb2e3ead4c44d2b811947ff4240f1c2.pdf
    • https://static.usrfiles.com/ugd/e8dba5_942ae4b820e0460b8664f48b3919e9ad.pdf
    • https://static.usrfiles.com/ugd/4c7633_d136dd8393b54ea3b7152aa9c76d7397.pdf
    • https://cdn.shopify.com/s/files/1/0449/5376/3999/files/56549089127.pdf
    • https://cdn.shopify.com/s/files/1/0432/5038/5051/files/furulojosoj.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082ce.bin
81fff63a3371a27b5e6facb630c5527ca27d0b45e7561117ebba56706d991a6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x82CE 4664 bytes
font_01_sfnt_off000092bc.bin
a88a20c1a6e42d9a0fc1e4801394c05bb595913b34c204399bc74fde68f8bcff
pdf-font-stream PDF embedded font (sfnt) at offset 0x92BC 10524 bytes
font_02_sfnt_off0000b684.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB684 4324 bytes