Malicious PDF — malware analysis report

Static analysis result for SHA-256 799dbf30247baa8f…

MALICIOUS

PDF

87.7 KB Created: 2020-07-08 11:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75faa15fab64f232677821ae171164fa SHA-1: b64669782e76ea41e2736126b4799b0e297f41af SHA-256: 799dbf30247baa8feb62e5552a1d75440bff94cf6a6926e5a257468ab52464bf
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded URLs, many pointing to disposable hosting, indicating a link farm designed for SEO manipulation or to redirect users to malicious sites. One URL, 'https://ttraff.ru/wb?keyword=imperata%20cylindrica%20pdf', is flagged as a known malicious redirector. 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=imperata%20cylindrica%20pdf
    • http://files.poitrading.com/uploads/1/3/2/7/132740398/muvime_wumipowakoko_sinodanebabeve_tuvuzewixu.pdf
    • http://files.jamesmatthewwilson.com/uploads/1/3/1/6/131637057/d1e23bb.pdf
    • http://files.katascuba.com/uploads/1/3/1/4/131483253/5349126.pdf
    • http://files.blog.saradeckard.com/uploads/1/3/2/6/132695572/1108863.pdf
    • http://files.mymaneattractionboutique.com/uploads/1/3/1/6/131637325/140efb07.pdf
    • http://files.stmarysorthchurch.org/uploads/1/3/2/6/132681316/2247594.pdf
    • http://files.bitmathedu.com/uploads/1/3/1/0/131071035/wovewo_noropotuji.pdf
    • http://files.namiracinecounty.org/uploads/1/3/1/8/131856950/mexuvogo_keduki_sitibupunapab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fozevet.files.wordpress.com/2020/07/jabodewil.pdf
    • https://wefefusijuro.files.wordpress.com/2020/06/56382996166.pdf
    • https://rofatekarem.files.wordpress.com/2020/07/xozisoxeloxosazubusol.pdf
    • https://tukesiza.files.wordpress.com/2020/07/mobozanuzisulowerelu.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_off00011b7f.bin
62d2740700ac661d54c5b286bfa479620b08b7b51026b9003157e52feaba04d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 4840 bytes
font_01_sfnt_off00012bce.bin
b49682e9a2702bdc68bdacdbc284946295c89789c5a0b223ddf288112b41b2b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCE 12064 bytes