Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed70ec359cad382…

MALICIOUS

PDF

56.9 KB Created: 2020-09-01 05:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f6babfeff44fd30b5c3e3a270ca93de SHA-1: 7edcf5f01db69291e99903eebf3e4317dbebe7cb SHA-256: 7ed70ec359cad3829234a965c55c2b4b3607e7b79906e04cab4475fb836146ee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the URL https://ttraff.ru/wix?keyword=nccn+guidelines+renal+cell+cancer. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to drive traffic to potentially harmful sites. The document body itself is heavily obfuscated and contains embedded URLs.

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.ru/wix?keyword=nccn+guidelines+renal+cell+cancer
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_02c3fd70c2d14184986d29059b796b8a.pdf
    • https://static.usrfiles.com/ugd/7dd30d_51807aabcdf04a47908cbb0112fb4e06.pdf
    • https://static.usrfiles.com/ugd/08fe48_9c325c0ee25245b9a2b09bdd3f194c05.pdf
    • https://static.usrfiles.com/ugd/9b33c5_89b9ec7580574fb88787dda88f074e9a.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_8beef3f51ae2411cbb44d68e2b3b5000.pdf
    • https://static.usrfiles.com/ugd/cec570_978ee0a79ea34829a59db8f9a1e0647a.pdf
    • https://static.usrfiles.com/ugd/5cf23b_aabc049301784385b337680f8b5eb8f0.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1285/files/actualizar_app_android_studio.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/nizazox.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/47724462384.pdf
    • https://cdn.shopify.com/s/files/1/0431/8425/9231/files/guwix.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5410/files/vegilakizafapubuzixisozi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2512/files/39597604784.pdf
    • https://cdn.shopify.com/s/files/1/0434/9453/9429/files/ludem.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009e24.bin
c887a26784ea14dbb78fdb38fa5783856b461bdfe4dcd27d48c4448fe7d2b2af
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E24 5076 bytes
font_01_sfnt_off0000af7b.bin
a64c953d93efbc9cd5d6bebc3bb3cc6525b72f8c24d4d057a253a3d845e93abd
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7B 12384 bytes