Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b54addce6acc781…

MALICIOUS

PDF

43.5 KB Created: 2020-09-02 04:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a3c5401a70fba160ab9d5cacddfdcb3 SHA-1: 3e2dc8b10d197db2b11f668594c34dd0a856ff1e SHA-256: 4b54addce6acc7813552f0a200f935dc5bbbbaa5a2e4fd0ae6ccbd3a81da7cce
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.me, disguised as a factoring worksheet. This suggests a phishing or social engineering attack aimed at directing users to malicious content. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify-hosted PDFs. 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=synthetic+division+factoring+worksheet
    • https://static.usrfiles.com/ugd/0c268c_af82f7a11d5342bda8a0f4c17d34d020.pdf
    • https://static.usrfiles.com/ugd/027f51_5aba0b8f450f48b6a1191b40c103af68.pdf
    • https://static.usrfiles.com/ugd/b8c837_71122891b4c64d9488dcbdef0f8eca2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_07678323f78b4d569390d06684eff081.pdf
    • https://cdn.shopify.com/s/files/1/0432/8135/0820/files/sebeludurema.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8909/files/84432456760.pdf
    • https://cdn.shopify.com/s/files/1/0431/9445/0082/files/complete_guitar_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/8592/9375/files/nunulegewatumosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5744/files/storytelling_with_data_cole_nussbaumer.pdf
    • https://cdn.shopify.com/s/files/1/0429/5321/2057/files/biwusanegizedoxikedowes.pdf
    • https://cdn.shopify.com/s/files/1/0436/1909/0595/files/check_out_time_2pac.pdf
    • https://cdn.shopify.com/s/files/1/0431/3051/9703/files/64272839013.pdf
    • https://static.usrfiles.com/ugd/e3834b_31ceab1fb30b466bab6e6d9bd8618367.pdf
    • https://static.usrfiles.com/ugd/6812d7_f0c97bdca985419a98ae27010f52b5ba.pdf
    • https://static.usrfiles.com/ugd/756799_de9e6f6c99734468a877c2c226247bfe.pdf
    • https://static.usrfiles.com/ugd/2e16aa_d32f571d736643c9aa55a3db633a7d5b.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_off00006b5c.bin
e673466f2e893728e3e39554626d6238c614e2295c282bddbea9c5cda5376d05
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5C 5672 bytes
font_01_sfnt_off00007eca.bin
76084a13f278433a1f539906777fdb88d99756173efcbe822286db81e33b655d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ECA 10032 bytes