Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d802e8471973ca…

MALICIOUS

PDF

42.8 KB Created: 2020-03-30 02:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0dd7ae0c09a31c37e51cefe133951015 SHA-1: cdadd925e05ad7ba16af7c1275648df9b03c4820 SHA-256: 54d802e8471973ca309f1a0642bc510f799adaaf7950f3458634d6bb176dfb96
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains text related to intervals and references the wkhtmltopdf tool, suggesting it was generated programmatically. The primary attack pattern appears to be a link farm designed to redirect users to potentially malicious content hosted on numerous domains.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://lists.accordionapocalypse.com/uploads/1/3/1/4/131437119/131437119.html#que+es+un+intervalo+no+acotado
    • http://peopleatthecore.com/uploads/1/3/0/6/130639646/5b2d6d.pdf
    • http://mimi-and-lolas-petcare.net/uploads/1/3/0/6/130621283/6344412.pdf
    • http://partssolution.co/uploads/1/3/0/6/130604805/855277.pdf
    • http://gandjfirearms.com/uploads/1/3/0/3/130313177/jawazaxisiret.pdf
    • http://rivierapsychotherapy.com/uploads/1/3/0/5/130588289/9398575.pdf
    • http://addictionsbakery.com/uploads/1/3/0/2/130271190/monetugi.pdf
    • http://minimaldatayang.com/uploads/1/3/0/6/130621870/pefibesikozuz_kaxaxis.pdf
    • http://garywallislaw.com/uploads/1/3/0/7/130775543/9967387.pdf
    • http://hawaiiqualitypo.com/uploads/1/3/0/5/130545043/645927a5c28d.pdf
    • http://alyssabousquet.com/uploads/1/3/1/4/131437425/bisola.pdf
    • http://hijamacuppingtcm.com/uploads/1/3/0/5/130589229/maziritatodumed_xakazo_sukimi_majuseru.pdf
    • http://sheanaelliott.com/uploads/1/3/0/6/130620839/dibijovifiza.pdf
    • http://danapowellenergy.com/uploads/1/3/0/8/130813722/setamexubasus_wafagijuxo_waxosusab.pdf
    • http://docebri.com/uploads/1/3/0/8/130813790/nejogugobolo_gawapal_vilulur.pdf
    • http://madewithlovebydanielle.com/uploads/1/3/0/7/130775395/wikoturazikixeg-nevoxikix.pdf
    • http://windstorm307.com/uploads/1/3/0/7/130739871/nonibigef-fabesa-kopira-goduzozegudox.pdf
    • http://distribuidoramario.net/uploads/1/3/0/8/130814342/fapikok.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_off0000633a.bin
cc7865b748c7e6cbabf49edd8f4852c60a5cfdd02706b25d4da8aa6ac0df1c1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x633A 10312 bytes
font_01_sfnt_off00008757.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0x8757 16036 bytes