Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c6e0f6aa0ab5ed…

MALICIOUS

PDF

33.8 KB Created: 2020-08-04 19:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dba6583609655745e0079b759919739e SHA-1: ab74933953e0f84c740c43e5c358559cf5c1e6d1 SHA-256: 65c6e0f6aa0ab5ed722f1d5fa1121e101a0d232c9e48fe7087bafaf98129b5e9
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One of these links, https://ttraff.cc/pify?keyword=bwv+974+piano+pdf, is identified as a known malicious redirector. The presence of numerous links suggests a link farm or redirection tactic to obscure the ultimate destination. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/pify?keyword=bwv+974+piano+pdf
    • http://files.annamckerrow.com/uploads/1/3/2/6/132682290/fegutadepedemeri.pdf
    • http://kulur.vistavocationalinc.com/uploads/1/3/1/6/131637240/fewurudisapuja.pdf
    • http://files.erinjeannewright.com/uploads/1/3/0/7/130740530/286b6ea4917bae.pdf
    • http://files.flashfoto.com.au/uploads/1/3/0/8/130813846/nivuladimotede.pdf
    • http://wimazav.browndogbiking.com/uploads/1/3/1/3/131383284/d2bb4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0564/8807/files/14047217274.pdf
    • https://cdn.shopify.com/s/files/1/0428/7060/3932/files/2008_honda_shadow_750.pdf
    • https://cdn.shopify.com/s/files/1/0431/8576/6561/files/naui_standards_and_policies_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0917/files/64933705289.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7569/files/6174520938.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/29001746215.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zabaravoxetifup.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/2017_lexus_gx_460_redesign.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/97088862363.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/porudix.pdf
    • https://cdn.shopify.com/s/files/1/0432/7827/0628/files/curl_put_json.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/aeration_tank_process.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_off0000472c.bin
ba3832a703ab89080b5cb73530e5b4bea8f0fb578ddf13b028b87f612cb683e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x472C 5252 bytes
font_01_sfnt_off0000594e.bin
b4672adb1864f462ac2a4fe4bfde4df2496c7ccdb56cd735b24046273bf11c09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x594E 9644 bytes

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