Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9035ccba3168f3…

MALICIOUS

PDF

95.0 KB Created: 2020-07-07 11:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ef5a9b50c652c6a0302253ec7f134b4 SHA-1: d7b1efd5f38090ef3e86e25357995a4c97567060 SHA-256: 0a9035ccba3168f325ecb02baeabbb02114267f53a3a57a7190cfcd51fa44dc0
194 Risk Score

Malware Insights

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

The PDF contains a high density of external links, many pointing to SEO-optimized PDF farms, and one critical link to known malicious redirector infrastructure. The document body, though malformed, contains a URL that is also present in the list of extracted URLs. The presence of a password-protected archive lure heuristic suggests an attempt to bypass security controls by encrypting a payload.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/wb?keyword=mapa%20provincia%20de%20almeria%20pdf#mapa+provincia+de+almeria+pdf
    • http://files.sbcopywriting.com/uploads/1/3/2/7/132740218/644292.pdf
    • http://files.gulnurozdaglar.com/uploads/1/3/2/3/132302913/38e83.pdf
    • http://files.yashbangera.com/uploads/1/3/0/7/130738625/83486b04a35.pdf
    • http://files.explorestanton.com/uploads/1/3/1/4/131453216/6741733.pdf
    • http://files.haralsoncountyhistory.com/uploads/1/3/2/3/132302913/4438840.pdf
    • http://files.proyecto1867.com/uploads/1/3/2/3/132302913/mozolejemi-vexiramiga-leselu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://tulibefeza.files.wordpress.com/2020/06/jigokopaxigefokabu.pdf
    • https://zawamibidixa.files.wordpress.com/2020/06/zofupuwulef.pdf
    • https://fadagazer.files.wordpress.com/2020/06/kimebididexejatobogower.pdf
    • https://raroxek.files.wordpress.com/2020/07/pubawozi.pdf
    • https://fububoxoludi.files.wordpress.com/2020/06/4488291696.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_off0001282b.bin
146c156a1e18ddce347df064388955b97cb9ced9535ce710aae3a9b4cdabd274
pdf-font-stream PDF embedded font (sfnt) at offset 0x1282B 4896 bytes
font_01_sfnt_off000138b7.bin
838104b8d0418d1fbd608339c1c9720631aad934dbe31d377c47e6a1e4e57836
pdf-font-stream PDF embedded font (sfnt) at offset 0x138B7 17500 bytes