Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4841e956e5b1541…

MALICIOUS

PDF

38.6 KB Created: 2020-08-30 19:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3130be92f757ff5745f0f2d5a546a625 SHA-1: 39d0e86649720e7de6fe4f631b183f9f1a4c866b SHA-256: b4841e956e5b15419a740e87169399a0570edbca33cadd231294c59f8bb7520e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector at 'https://ttraff.com/wix?keyword=toro+greenskeeper+212'. Additionally, it hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning attempt. The document body contains obfuscated text and references to the redirector URL.

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.com/wix?keyword=toro+greenskeeper+212
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/benim_hocam_kpss_corafya_ders_notlar.pdf
    • https://cdn.shopify.com/s/files/1/0430/7851/6885/files/69879707715.pdf
    • https://cdn.shopify.com/s/files/1/0436/5464/3877/files/52457852539.pdf
    • https://cdn.shopify.com/s/files/1/0429/4275/9071/files/fadakukujitidafufulir.pdf
    • https://static.usrfiles.com/ugd/9219f8_2e370e8372964f5692dfbc7f017102cc.pdf
    • https://static.usrfiles.com/ugd/a44510_7f6c461602f347078308f6a0af680587.pdf
    • https://cdn.shopify.com/s/files/1/0461/4884/5731/files/72238040863.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0750/files/48932216138.pdf
    • https://cdn.shopify.com/s/files/1/0436/5585/6281/files/dopinutajomajokopo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4456/7197/files/benim_hoca_video_ders_notlar_eitim_bilimleri.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4199/files/complete_website_development_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/2548/9305/files/haloperidol_bula_profissional.pdf
    • https://cdn.shopify.com/s/files/1/0437/5671/6186/files/gedenobo.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_off000059a0.bin
ea886a9cd55444efd44cb32f52b15cc5c03c7b06bd7dcf5ad8e0973ac143b9af
pdf-font-stream PDF embedded font (sfnt) at offset 0x59A0 4940 bytes
font_01_sfnt_off00006a94.bin
42e3b4658f715beffbe076f09993c1a8f8d197d19f64e103cc4d652954c42813
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A94 10468 bytes